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x+(x-12)=100
We move all terms to the left:
x+(x-12)-(100)=0
We get rid of parentheses
x+x-12-100=0
We add all the numbers together, and all the variables
2x-112=0
We move all terms containing x to the left, all other terms to the right
2x=112
x=112/2
x=56
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