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-12(7+9x)=-4(1+7x)
We move all terms to the left:
-12(7+9x)-(-4(1+7x))=0
We add all the numbers together, and all the variables
-12(9x+7)-(-4(7x+1))=0
We multiply parentheses
-108x-(-4(7x+1))-84=0
We calculate terms in parentheses: -(-4(7x+1)), so:We get rid of parentheses
-4(7x+1)
We multiply parentheses
-28x-4
Back to the equation:
-(-28x-4)
-108x+28x+4-84=0
We add all the numbers together, and all the variables
-80x-80=0
We move all terms containing x to the left, all other terms to the right
-80x=80
x=80/-80
x=-1
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