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100=8x+12
We move all terms to the left:
100-(8x+12)=0
We get rid of parentheses
-8x-12+100=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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