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4x-4=-40+x
We move all terms to the left:
4x-4-(-40+x)=0
We add all the numbers together, and all the variables
4x-(x-40)-4=0
We get rid of parentheses
4x-x+40-4=0
We add all the numbers together, and all the variables
3x+36=0
We move all terms containing x to the left, all other terms to the right
3x=-36
x=-36/3
x=-12
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