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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-28=0
We move all terms containing x to the left, all other terms to the right
2x=28
x=28/2
x=14
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