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x+(x-12)=40
We move all terms to the left:
x+(x-12)-(40)=0
We get rid of parentheses
x+x-12-40=0
We add all the numbers together, and all the variables
2x-52=0
We move all terms containing x to the left, all other terms to the right
2x=52
x=52/2
x=26
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