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4(1+2x)=-76
We move all terms to the left:
4(1+2x)-(-76)=0
We add all the numbers together, and all the variables
4(2x+1)-(-76)=0
We add all the numbers together, and all the variables
4(2x+1)+76=0
We multiply parentheses
8x+4+76=0
We add all the numbers together, and all the variables
8x+80=0
We move all terms containing x to the left, all other terms to the right
8x=-80
x=-80/8
x=-10
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