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6x+2-2(x-4)=90
We move all terms to the left:
6x+2-2(x-4)-(90)=0
We add all the numbers together, and all the variables
6x-2(x-4)-88=0
We multiply parentheses
6x-2x+8-88=0
We add all the numbers together, and all the variables
4x-80=0
We move all terms containing x to the left, all other terms to the right
4x=80
x=80/4
x=20
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