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x=12/13
We move all terms to the left:
x-(12/13)=0
We add all the numbers together, and all the variables
x-(+12/13)=0
We get rid of parentheses
x-12/13=0
We multiply all the terms by the denominator
x*13-12=0
Wy multiply elements
13x-12=0
We move all terms containing x to the left, all other terms to the right
13x=12
x=12/13
x=12/13
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