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X+(X+10)=69
We move all terms to the left:
X+(X+10)-(69)=0
We get rid of parentheses
X+X+10-69=0
We add all the numbers together, and all the variables
2X-59=0
We move all terms containing X to the left, all other terms to the right
2X=59
X=59/2
X=29+1/2
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