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108+8x=-5x-9
We move all terms to the left:
108+8x-(-5x-9)=0
We get rid of parentheses
8x+5x+9+108=0
We add all the numbers together, and all the variables
13x+117=0
We move all terms containing x to the left, all other terms to the right
13x=-117
x=-117/13
x=-9
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