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6(3-4x)=-2(21-3x)
We move all terms to the left:
6(3-4x)-(-2(21-3x))=0
We add all the numbers together, and all the variables
6(-4x+3)-(-2(-3x+21))=0
We multiply parentheses
-24x-(-2(-3x+21))+18=0
We calculate terms in parentheses: -(-2(-3x+21)), so:We get rid of parentheses
-2(-3x+21)
We multiply parentheses
6x-42
Back to the equation:
-(6x-42)
-24x-6x+42+18=0
We add all the numbers together, and all the variables
-30x+60=0
We move all terms containing x to the left, all other terms to the right
-30x=-60
x=-60/-30
x=+2
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