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(3x+13)=103
We move all terms to the left:
(3x+13)-(103)=0
We get rid of parentheses
3x+13-103=0
We add all the numbers together, and all the variables
3x-90=0
We move all terms containing x to the left, all other terms to the right
3x=90
x=90/3
x=30
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