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=0.4N+3.39N-25.89N+307.1N
We move all terms to the left:
-(0.4N+3.39N-25.89N+307.1N)=0
We add all the numbers together, and all the variables
-(+285N)=0
We get rid of parentheses
-285N=0
N=0/-285
N=0
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