did i do this rite??math experts!!!?

Question

2/3x+9=-21
-9 -9
2/3x=-30
_ _
2/3 2/3

k the lines above the 2/3s r supposed to bigger or longer, actuly i dont get it but yaa...my friend tryed to show me with a different problem and as u can see its probably wrong because i dont get it it so can anyone help me and explain how to do this, best answer goes to the one that looks correct and the polite one that tells me nicly ..sorry but there has been rude people out there....ha!good luck because im still worken on other math junk...thnx to all answers in the mean time

Answer 1

2/3x+9=-21

subtract 9 from both sides

2/3x =-30

multiply both sides by 3

2x = -90

divide both sides by 2

x = -45
.

Answer 2

Both the previous answerers are right.

I will explain it just a bit more.

2/3 x + 9 = -21
subtract 9 from both sides

2/3 x + 9 - 9 = -21 -9

2/3 x = -30

multiply by 3/2 on both sides

x = -30 * 3/2

x = - 90/2

x = - 45 (Answer)

Answer 3

2/3x+9=-21

You can do anything to an equation as long as you do the same thing on both sides ot the equation.

First subtract 9 from both sides of the equation:

2/3x+9-9=-21-9 giving 2/3x= -30

now to solve for x, divide both sides by 2/3

Note: to divide by a fraction you can invert the fraction and mutliply by it.

so:
3/2*2/3x=-30*3/2

giving x=-45

Answer 4

You had me up to 2/3x=-30, but after that you lost me a little. Here is how I'd finish it up
2/3 * x = -30
*3 = *3
2*x=-90
/2 = /2
x=-45
Hope that helps