Posted by **April** on Thursday, August 26, 2010 at 5:03pm.

How do you know when to move the number to the left or the right.

For example

(x-5)/(x+8)=5/7 or

(y-2)/(y+2)=3/7

- Rational Expressions and Equations -
**drwls**, Thursday, August 26, 2010 at 5:08pm
What are you trying to do? Solve for the unknown (x or y?)

First get rid of the fractions that have the unknowns in the denomimator. It is not a question of moving right or left.

In the first case,

7(x-5) = 5(x+8)

7x -35 = 5x + 40

2x = 75

x = 37.5

- Rational Expressions and Equations -
**April**, Thursday, August 26, 2010 at 5:16pm
I know the first problems answer is 2/75 and the second is 5 and in both cases I seem to mess up on the last part of moving the numbers like for instance in the 2/75 I first had the answer of 75/2 I had the numbers right but the wrong placement and the same with the other I first had 4/20 instead of 20/4 which equals 5 so I need to know how do you know which way to move the number to the left or the right?

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