SOLUTION: Can you help me solve the following for x : x/(x+3) = 5/(x+7) Thanks!

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Question 81887: Can you help me solve the following for x :
x/(x+3) = 5/(x+7)
Thanks!
Answer by sofiyacherni(99) About Me  (Show Source):
You can put this solution on YOUR website!
cross multiply, then you get
x%28x%2B7%29=5%28x%2B3%29 multiply through
x%5E2%2B7x=5x%2B15 get all the terms on one side
x%5E2%2B7x-5x-15=0 simplify
x%5E2%2B2x-15=0 this factors into
%28x%2B5%29%28x-3%29=0 so
x%2B5=0 and x-3=0 so you have two solutions
x=-5 or x=3