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15-2n=3n-5
We move all terms to the left:
15-2n-(3n-5)=0
We get rid of parentheses
-2n-3n+5+15=0
We add all the numbers together, and all the variables
-5n+20=0
We move all terms containing n to the left, all other terms to the right
-5n=-20
n=-20/-5
n=+4
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