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25=n.40
We move all terms to the left:
25-(n.40)=0
We add all the numbers together, and all the variables
-(+n.40)+25=0
We get rid of parentheses
-n.40+25=0
We move all terms containing n to the left, all other terms to the right
-n.40=-25
n=-25/1
n=-25
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