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-33=3(x-7)
We move all terms to the left:
-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+21-33=0
We add all the numbers together, and all the variables
-3x-12=0
We move all terms containing x to the left, all other terms to the right
-3x=12
x=12/-3
x=-4
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