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(3x-13)=90
We move all terms to the left:
(3x-13)-(90)=0
We get rid of parentheses
3x-13-90=0
We add all the numbers together, and all the variables
3x-103=0
We move all terms containing x to the left, all other terms to the right
3x=103
x=103/3
x=34+1/3
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