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-6x+39=-9(x-1)
We move all terms to the left:
-6x+39-(-9(x-1))=0
We calculate terms in parentheses: -(-9(x-1)), so:We get rid of parentheses
-9(x-1)
We multiply parentheses
-9x+9
Back to the equation:
-(-9x+9)
-6x+9x-9+39=0
We add all the numbers together, and all the variables
3x+30=0
We move all terms containing x to the left, all other terms to the right
3x=-30
x=-30/3
x=-10
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