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25=4n+13
We move all terms to the left:
25-(4n+13)=0
We get rid of parentheses
-4n-13+25=0
We add all the numbers together, and all the variables
-4n+12=0
We move all terms containing n to the left, all other terms to the right
-4n=-12
n=-12/-4
n=+3
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