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X+(X+5)=83
We move all terms to the left:
X+(X+5)-(83)=0
We get rid of parentheses
X+X+5-83=0
We add all the numbers together, and all the variables
2X-78=0
We move all terms containing X to the left, all other terms to the right
2X=78
X=78/2
X=39
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