what is the answers for these algabra problems?

Question

3/5x=-21 what is (X) that is 3 over 5
2/3x+8/3=20/3 what is (X)
c/-7=12 what is (C)
3/4x-2/5=4/7 what is (X)

Answer 1

3/5x= - 21

5(3/5x) = 5 ( - 21)

3x + - 105

3x/3 = 105/3

x = - 35

The answer is x = - 35

Insert the x value into the equation

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Check


3/5 x = - 21

3/5( - 35) = - 21

- 105/5 = - 21

- 21 = - 21

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2/3x + 8/3 = 20/3

3(2/3x) + 3(8/3) = 3(20/3)

2x + 8 = 20

2x + 8 - 8 = 20 - 8

2x = 12

2x/2 = 12/2

x = 6

The answer is x = 6

Insert the x value into the equation

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Check

2/3x + 8/3 = 20/3

2/3(6) + 8/3 = 20/3

12/3 + 2.666666667 = 6.666666667

4 + 2.666666667 = 6.666666667

6.666666667 = 6.666666667

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c/ -7 = 12

- 7 (c/-7 = - 7(12)

c = - 84

The answer is c = - 84

Insert the c value into the equation

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Check

c/-7 = 12

- 84 / - 7 = 12

12 = 12

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Answer 2

Answer 1:
3/5x=-21
5x = -21/3 (Divide both sides by 3)
5x = -7
x = -7/5 (or) -1.40

Answer 2:
2/3x+8/3=20/3
2/3x = 20/3 - 8/3 (Subtract both sides by 8/3)
2/3x = (20-8)/3
2/3x = 12/3
2/3x = 4
3x = 4/2
3x = 2
x = 2/3

Answer 3:
c/-7=12
c = 12*-7 (Multiply both sides by -7)
c = -84

Answer 4:
3/4x-2/5=4/7
3/4x = 4/7 - 2/5
3/4x = 20/35 - 14/35
3/4x = 6/35
4x = 6/(35*3)
4x = 6/105
6*4x = 105 (Multiply both sides by 6)
24x = 105
x = 105/24
x = 35/8

Answer 3

3/5x=-21 first divide both sidesw by 3/5
3/5x divided by 3/5= -21 divided by 3/5
x=-21(5/3)
x=-35

2/3x+8/3=20/3
2/3x=20/3-8/3
2/3x=12/3
x=12/3(3/2)
x=24

c/-7=12
c/-7 divided by -1/7=12 divided by -1/7
c=12(-7)
c=-84

for the last equation you will do the same...

Answer 4

Question 1:

Multiply both sides by 5/3, that will cancel out the 3/5
(Answer is -35)

Question 2

Subtract 8/3 from both sides, THEN multiply both sides by 3/2

Answer=6

Question 3

Multiply each side by -7

Answer is -84



Question 4

Add 2/5 to each side, THEN multiply each side by 4/3

Answer = 136/105

Hope that helps


(This is REALLY SIMPLE everyone, why are some of you screwing up so bad? Check your answers by plugging them back into the X values)

Answer 5

For each question, try to isolate the unknown by performing the same functions on both "sides" of your equal sign.