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7(2x+1)=5x-20
We move all terms to the left:
7(2x+1)-(5x-20)=0
We multiply parentheses
14x-(5x-20)+7=0
We get rid of parentheses
14x-5x+20+7=0
We add all the numbers together, and all the variables
9x+27=0
We move all terms containing x to the left, all other terms to the right
9x=-27
x=-27/9
x=-3
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