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7x+5(-x-12)=-80
We move all terms to the left:
7x+5(-x-12)-(-80)=0
We add all the numbers together, and all the variables
7x+5(-1x-12)-(-80)=0
We add all the numbers together, and all the variables
7x+5(-1x-12)+80=0
We multiply parentheses
7x-5x-60+80=0
We add all the numbers together, and all the variables
2x+20=0
We move all terms containing x to the left, all other terms to the right
2x=-20
x=-20/2
x=-10
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