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-1+4(4+3x)=-81
We move all terms to the left:
-1+4(4+3x)-(-81)=0
We add all the numbers together, and all the variables
4(3x+4)-1-(-81)=0
We add all the numbers together, and all the variables
4(3x+4)+80=0
We multiply parentheses
12x+16+80=0
We add all the numbers together, and all the variables
12x+96=0
We move all terms containing x to the left, all other terms to the right
12x=-96
x=-96/12
x=-8
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