SOLUTION: Solve for x: (x-3) / (x+5) = 3/7 a) 9 b) 36 c) 3 d) 13/2 e) none of these

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Solve for x: (x-3) / (x+5) = 3/7 a) 9 b) 36 c) 3 d) 13/2 e) none of these      Log On


   

Question 60910: Solve for x: (x-3) / (x+5) = 3/7
a) 9
b) 36
c) 3
d) 13/2
e) none of these
Answer by joyofmath(189) About Me  (Show Source):
You can put this solution on YOUR website!
%28x-3%29%2F%28x%2B5%29+=+3%2F7
Multiply both sides by 7.
Then, 7%28x-3%29%2F%28x%2B5%29+=+3
Divide both sides by 3.
Then, %287%28x-3%29%29%2F%283%28x%2B5%29%29+=+1
Or, 7%28x-3%29+=+3%28x%2B5%29
So, 7x-21+=+3x%2B15
Subtract 3x from both sides.
Then, 4x-21+=+15
Or, 4x=36
So, x=9