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(X-16)+(X+3)=X+42
We move all terms to the left:
(X-16)+(X+3)-(X+42)=0
We get rid of parentheses
X+X-X-16+3-42=0
We add all the numbers together, and all the variables
X-55=0
We move all terms containing X to the left, all other terms to the right
X=55
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