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5x-(-8)=4x-8=31
We move all terms to the left:
5x-(-8)-(4x-8)=0
We add all the numbers together, and all the variables
5x-(4x-8)+8=0
We get rid of parentheses
5x-4x+8+8=0
We add all the numbers together, and all the variables
x+16=0
We move all terms containing x to the left, all other terms to the right
x=-16
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