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7x-(4x-1)=-80
We move all terms to the left:
7x-(4x-1)-(-80)=0
We add all the numbers together, and all the variables
7x-(4x-1)+80=0
We get rid of parentheses
7x-4x+1+80=0
We add all the numbers together, and all the variables
3x+81=0
We move all terms containing x to the left, all other terms to the right
3x=-81
x=-81/3
x=-27
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