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-3=5N+21
We move all terms to the left:
-3-(5N+21)=0
We get rid of parentheses
-5N-21-3=0
We add all the numbers together, and all the variables
-5N-24=0
We move all terms containing N to the left, all other terms to the right
-5N=24
N=24/-5
N=-4+4/5
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