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12-4x+8x=-2(-3x+1)
We move all terms to the left:
12-4x+8x-(-2(-3x+1))=0
We add all the numbers together, and all the variables
4x-(-2(-3x+1))+12=0
We calculate terms in parentheses: -(-2(-3x+1)), so:We get rid of parentheses
-2(-3x+1)
We multiply parentheses
6x-2
Back to the equation:
-(6x-2)
4x-6x+2+12=0
We add all the numbers together, and all the variables
-2x+14=0
We move all terms containing x to the left, all other terms to the right
-2x=-14
x=-14/-2
x=+7
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