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x+100=-3x-8
We move all terms to the left:
x+100-(-3x-8)=0
We get rid of parentheses
x+3x+8+100=0
We add all the numbers together, and all the variables
4x+108=0
We move all terms containing x to the left, all other terms to the right
4x=-108
x=-108/4
x=-27
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