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-109=-8x-21
We move all terms to the left:
-109-(-8x-21)=0
We get rid of parentheses
8x+21-109=0
We add all the numbers together, and all the variables
8x-88=0
We move all terms containing x to the left, all other terms to the right
8x=88
x=88/8
x=11
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