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20+(6x-2)=90
We move all terms to the left:
20+(6x-2)-(90)=0
We add all the numbers together, and all the variables
(6x-2)-70=0
We get rid of parentheses
6x-2-70=0
We add all the numbers together, and all the variables
6x-72=0
We move all terms containing x to the left, all other terms to the right
6x=72
x=72/6
x=12
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