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7x+5(-x+13)=89
We move all terms to the left:
7x+5(-x+13)-(89)=0
We add all the numbers together, and all the variables
7x+5(-1x+13)-89=0
We multiply parentheses
7x-5x+65-89=0
We add all the numbers together, and all the variables
2x-24=0
We move all terms containing x to the left, all other terms to the right
2x=24
x=24/2
x=12
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