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+(N*0.15)=90
We move all terms to the left:
+(N*0.15)-(90)=0
We add all the numbers together, and all the variables
(+N*0.15)-90=0
We get rid of parentheses
N*0.15-90=0
Wy multiply elements
0.15N-90=0
We move all terms containing N to the left, all other terms to the right
0.15N=90
N=90/0.15
N=600
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