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--36=3(x-7)
We move all terms to the left:
--36-(3(x-7))=0
We add all the numbers together, and all the variables
-(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=0
We move all terms containing x to the left, all other terms to the right
-3x=-21
x=-21/-3
x=+7
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