2007-01-20 06:38:01 · 4 answers · asked by Lucia O 1 in Science & Mathematics ➔ Mathematics
This should have been written like this
x/2 = 3x/4 + 5
because the way you have it makes it look like the denominator for the right side is 4+5.
2x/4 = 3x/4 + 5
2x/4 - 3x/4 = 3x/4 - 3x/4 + 5
-x/4 = 5
-x/4 ^ 4 = 5 ^ 4
-x = 20
x = -20
2007-01-20 06:42:32 · answer #1 · answered by marklemoore 6 · 0⤊ 1⤋
First, find the LCD of the right side. One easy way to do this is to think that 5 is 20/4. Then you can combine like terms of the right as,
(3x+20)/4
But the left side is x/2 so you can think of this as 2x/4 also because you need a common denominator.
so 2x/4 = (3x +20)/4.
Cancel 4 ( Convince yourself you can do this, clue: cross x and cancel) Then, you are left with 2x = 3x + 20
Rearrange, combine 3x and 2x, subtract 5 and you get
-20 = 3x-2x or x = - 20
2007-01-20 06:55:06 · answer #2 · answered by Aldo 5 · 0⤊ 0⤋
1-subtract the 5 from both sides
2-divide by x/2 on both sides
3-multiply 3x/4 by 2/x the product here is 3/2 which is NOT equal to -5
you're welcome
2007-01-20 06:44:24 · answer #3 · answered by Batata 2 · 0⤊ 1⤋
x=6x/4+5
x-10=6x/4
4x-40=6x
2x=-40
x=-20
2007-01-20 07:02:58 · answer #4 · answered by verner66 2 · 0⤊ 0⤋