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=3.5+2.8N-2.8
We move all terms to the left:
-(3.5+2.8N-2.8)=0
We add all the numbers together, and all the variables
-(2.8N+0.7)=0
We get rid of parentheses
-2.8N-0.7=0
We move all terms containing N to the left, all other terms to the right
-2.8N=0.7
N=0.7/-2.8
N=-0.7/2.8
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