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3n-12=5n-25
We move all terms to the left:
3n-12-(5n-25)=0
We get rid of parentheses
3n-5n+25-12=0
We add all the numbers together, and all the variables
-2n+13=0
We move all terms containing n to the left, all other terms to the right
-2n=-13
n=-13/-2
n=6+1/2
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