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-40=8n+15-3n-
We move all terms to the left:
-40-(8n+15-3n-)=0
We add all the numbers together, and all the variables
-(+5n)-40=0
We get rid of parentheses
-5n-40=0
We move all terms containing n to the left, all other terms to the right
-5n=40
n=40/-5
n=-8
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