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12x+8=3x-89
We move all terms to the left:
12x+8-(3x-89)=0
We get rid of parentheses
12x-3x+89+8=0
We add all the numbers together, and all the variables
9x+97=0
We move all terms containing x to the left, all other terms to the right
9x=-97
x=-97/9
x=-10+7/9
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