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3x-33=-3(x+7)
We move all terms to the left:
3x-33-(-3(x+7))=0
We calculate terms in parentheses: -(-3(x+7)), so:We get rid of parentheses
-3(x+7)
We multiply parentheses
-3x-21
Back to the equation:
-(-3x-21)
3x+3x+21-33=0
We add all the numbers together, and all the variables
6x-12=0
We move all terms containing x to the left, all other terms to the right
6x=12
x=12/6
x=2
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