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13+(8x-2)=90
We move all terms to the left:
13+(8x-2)-(90)=0
We add all the numbers together, and all the variables
(8x-2)-77=0
We get rid of parentheses
8x-2-77=0
We add all the numbers together, and all the variables
8x-79=0
We move all terms containing x to the left, all other terms to the right
8x=79
x=79/8
x=9+7/8
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