SOLUTION: if a=2x+3 and b=4x-7, for what value of x is 3b=5a?

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Question 470153: if a=2x+3 and b=4x-7, for what value of x is 3b=5a?
Answer by Tatiana_Stebko(1539) About Me  (Show Source):
You can put this solution on YOUR website!
if b=4x-7, then 3b=3%284x-7%29=12x-21
if +a=2x%2B3, then 5a=5%282x%2B3%29=10x%2B15
3b=5a, so 12x-21=10x%2B15
12x-10x=15%2B21
2x=36
x=36%2F2
x=18