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15=2n-3
We move all terms to the left:
15-(2n-3)=0
We get rid of parentheses
-2n+3+15=0
We add all the numbers together, and all the variables
-2n+18=0
We move all terms containing n to the left, all other terms to the right
-2n=-18
n=-18/-2
n=+9
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