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