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21-6x=3(x-2)
We move all terms to the left:
21-6x-(3(x-2))=0
We calculate terms in parentheses: -(3(x-2)), so:We get rid of parentheses
3(x-2)
We multiply parentheses
3x-6
Back to the equation:
-(3x-6)
-6x-3x+6+21=0
We add all the numbers together, and all the variables
-9x+27=0
We move all terms containing x to the left, all other terms to the right
-9x=-27
x=-27/-9
x=+3
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