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25=x/13+12
We move all terms to the left:
25-(x/13+12)=0
We get rid of parentheses
-x/13-12+25=0
We multiply all the terms by the denominator
-x-12*13+25*13=0
We add all the numbers together, and all the variables
-1x+169=0
We move all terms containing x to the left, all other terms to the right
-x=-169
x=-169/-1
x=+169
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