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4=3+n/18
We move all terms to the left:
4-(3+n/18)=0
We add all the numbers together, and all the variables
-(n/18+3)+4=0
We get rid of parentheses
-n/18-3+4=0
We multiply all the terms by the denominator
-n-3*18+4*18=0
We add all the numbers together, and all the variables
-1n+18=0
We move all terms containing n to the left, all other terms to the right
-n=-18
n=-18/-1
n=+18
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