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-6x+7(-2x+6)=-138
We move all terms to the left:
-6x+7(-2x+6)-(-138)=0
We add all the numbers together, and all the variables
-6x+7(-2x+6)+138=0
We multiply parentheses
-6x-14x+42+138=0
We add all the numbers together, and all the variables
-20x+180=0
We move all terms containing x to the left, all other terms to the right
-20x=-180
x=-180/-20
x=+9
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