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66=6x-2(-3x-3)
We move all terms to the left:
66-(6x-2(-3x-3))=0
We calculate terms in parentheses: -(6x-2(-3x-3)), so:We get rid of parentheses
6x-2(-3x-3)
We multiply parentheses
6x+6x+6
We add all the numbers together, and all the variables
12x+6
Back to the equation:
-(12x+6)
-12x-6+66=0
We add all the numbers together, and all the variables
-12x+60=0
We move all terms containing x to the left, all other terms to the right
-12x=-60
x=-60/-12
x=+5
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