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7(2x+3)=13x-15
We move all terms to the left:
7(2x+3)-(13x-15)=0
We multiply parentheses
14x-(13x-15)+21=0
We get rid of parentheses
14x-13x+15+21=0
We add all the numbers together, and all the variables
x+36=0
We move all terms containing x to the left, all other terms to the right
x=-36
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