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X+(X+40)=10
We move all terms to the left:
X+(X+40)-(10)=0
We get rid of parentheses
X+X+40-10=0
We add all the numbers together, and all the variables
2X+30=0
We move all terms containing X to the left, all other terms to the right
2X=-30
X=-30/2
X=-15
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