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5x+3(5x+1)=63
We move all terms to the left:
5x+3(5x+1)-(63)=0
We multiply parentheses
5x+15x+3-63=0
We add all the numbers together, and all the variables
20x-60=0
We move all terms containing x to the left, all other terms to the right
20x=60
x=60/20
x=3
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