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4(-1-7x)=80
We move all terms to the left:
4(-1-7x)-(80)=0
We add all the numbers together, and all the variables
4(-7x-1)-80=0
We multiply parentheses
-28x-4-80=0
We add all the numbers together, and all the variables
-28x-84=0
We move all terms containing x to the left, all other terms to the right
-28x=84
x=84/-28
x=-3
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