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X+12=2(X+12)-4
We move all terms to the left:
X+12-(2(X+12)-4)=0
We calculate terms in parentheses: -(2(X+12)-4), so:We get rid of parentheses
2(X+12)-4
We multiply parentheses
2X+24-4
We add all the numbers together, and all the variables
2X+20
Back to the equation:
-(2X+20)
X-2X-20+12=0
We add all the numbers together, and all the variables
-1X-8=0
We move all terms containing X to the left, all other terms to the right
-X=8
X=8/-1
X=-8
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