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6x-4(1+7x)=84
We move all terms to the left:
6x-4(1+7x)-(84)=0
We add all the numbers together, and all the variables
6x-4(7x+1)-84=0
We multiply parentheses
6x-28x-4-84=0
We add all the numbers together, and all the variables
-22x-88=0
We move all terms containing x to the left, all other terms to the right
-22x=88
x=88/-22
x=-4
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