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0=18n-90-n
We move all terms to the left:
0-(18n-90-n)=0
We add all the numbers together, and all the variables
-(17n-90)+0=0
We add all the numbers together, and all the variables
-(17n-90)=0
We get rid of parentheses
-17n+90=0
We move all terms containing n to the left, all other terms to the right
-17n=-90
n=-90/-17
n=5+5/17
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