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x+(3x-4)=-16
We move all terms to the left:
x+(3x-4)-(-16)=0
We add all the numbers together, and all the variables
x+(3x-4)+16=0
We get rid of parentheses
x+3x-4+16=0
We add all the numbers together, and all the variables
4x+12=0
We move all terms containing x to the left, all other terms to the right
4x=-12
x=-12/4
x=-3
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