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25n=5n-90=0
We move all terms to the left:
25n-(5n-90)=0
We get rid of parentheses
25n-5n+90=0
We add all the numbers together, and all the variables
20n+90=0
We move all terms containing n to the left, all other terms to the right
20n=-90
n=-90/20
n=-4+1/2
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