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X+10=2(X+15)
We move all terms to the left:
X+10-(2(X+15))=0
We calculate terms in parentheses: -(2(X+15)), so:We get rid of parentheses
2(X+15)
We multiply parentheses
2X+30
Back to the equation:
-(2X+30)
X-2X-30+10=0
We add all the numbers together, and all the variables
-1X-20=0
We move all terms containing X to the left, all other terms to the right
-X=20
X=20/-1
X=-20
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