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66=3x+3(x-2)
We move all terms to the left:
66-(3x+3(x-2))=0
We calculate terms in parentheses: -(3x+3(x-2)), so:We get rid of parentheses
3x+3(x-2)
We multiply parentheses
3x+3x-6
We add all the numbers together, and all the variables
6x-6
Back to the equation:
-(6x-6)
-6x+6+66=0
We add all the numbers together, and all the variables
-6x+72=0
We move all terms containing x to the left, all other terms to the right
-6x=-72
x=-72/-6
x=+12
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