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7x+80=4x-7
We move all terms to the left:
7x+80-(4x-7)=0
We get rid of parentheses
7x-4x+7+80=0
We add all the numbers together, and all the variables
3x+87=0
We move all terms containing x to the left, all other terms to the right
3x=-87
x=-87/3
x=-29
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