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-21=3x-3(3x-11)
We move all terms to the left:
-21-(3x-3(3x-11))=0
We calculate terms in parentheses: -(3x-3(3x-11)), so:We get rid of parentheses
3x-3(3x-11)
We multiply parentheses
3x-9x+33
We add all the numbers together, and all the variables
-6x+33
Back to the equation:
-(-6x+33)
6x-33-21=0
We add all the numbers together, and all the variables
6x-54=0
We move all terms containing x to the left, all other terms to the right
6x=54
x=54/6
x=9
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