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-6(-7+7x)=-84
We move all terms to the left:
-6(-7+7x)-(-84)=0
We add all the numbers together, and all the variables
-6(7x-7)-(-84)=0
We add all the numbers together, and all the variables
-6(7x-7)+84=0
We multiply parentheses
-42x+42+84=0
We add all the numbers together, and all the variables
-42x+126=0
We move all terms containing x to the left, all other terms to the right
-42x=-126
x=-126/-42
x=+3
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