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-6x+30=3(x+7)
We move all terms to the left:
-6x+30-(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)
-6x-3x-21+30=0
We add all the numbers together, and all the variables
-9x+9=0
We move all terms containing x to the left, all other terms to the right
-9x=-9
x=-9/-9
x=1
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