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(X+10)+(X+12)=3
We move all terms to the left:
(X+10)+(X+12)-(3)=0
We get rid of parentheses
X+X+10+12-3=0
We add all the numbers together, and all the variables
2X+19=0
We move all terms containing X to the left, all other terms to the right
2X=-19
X=-19/2
X=-9+1/2
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