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X+12=-2(3-5X)
We move all terms to the left:
X+12-(-2(3-5X))=0
We add all the numbers together, and all the variables
X-(-2(-5X+3))+12=0
We calculate terms in parentheses: -(-2(-5X+3)), so:We get rid of parentheses
-2(-5X+3)
We multiply parentheses
10X-6
Back to the equation:
-(10X-6)
X-10X+6+12=0
We add all the numbers together, and all the variables
-9X+18=0
We move all terms containing X to the left, all other terms to the right
-9X=-18
X=-18/-9
X=+2
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