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(3x-1)+(3x-1)=x+13
We move all terms to the left:
(3x-1)+(3x-1)-(x+13)=0
We get rid of parentheses
3x+3x-x-1-1-13=0
We add all the numbers together, and all the variables
5x-15=0
We move all terms containing x to the left, all other terms to the right
5x=15
x=15/5
x=3
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