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8x+12=x+19+70
We move all terms to the left:
8x+12-(x+19+70)=0
We add all the numbers together, and all the variables
8x-(x+89)+12=0
We get rid of parentheses
8x-x-89+12=0
We add all the numbers together, and all the variables
7x-77=0
We move all terms containing x to the left, all other terms to the right
7x=77
x=77/7
x=11
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