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