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-15=n/3+-20
We move all terms to the left:
-15-(n/3+-20)=0
We add all the numbers together, and all the variables
-(n/3-20)-15=0
We get rid of parentheses
-n/3+20-15=0
We multiply all the terms by the denominator
-n+20*3-15*3=0
We add all the numbers together, and all the variables
-1n+15=0
We move all terms containing n to the left, all other terms to the right
-n=-15
n=-15/-1
n=+15
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