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X+18=2(2X+3)
We move all terms to the left:
X+18-(2(2X+3))=0
We calculate terms in parentheses: -(2(2X+3)), so:We get rid of parentheses
2(2X+3)
We multiply parentheses
4X+6
Back to the equation:
-(4X+6)
X-4X-6+18=0
We add all the numbers together, and all the variables
-3X+12=0
We move all terms containing X to the left, all other terms to the right
-3X=-12
X=-12/-3
X=+4
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