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+9=-4N+8N
We move all terms to the left:
+9-(-4N+8N)=0
We add all the numbers together, and all the variables
-(+4N)+9=0
We get rid of parentheses
-4N+9=0
We move all terms containing N to the left, all other terms to the right
-4N=-9
N=-9/-4
N=2+1/4
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