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105=85+n
We move all terms to the left:
105-(85+n)=0
We add all the numbers together, and all the variables
-(n+85)+105=0
We get rid of parentheses
-n-85+105=0
We add all the numbers together, and all the variables
-1n+20=0
We move all terms containing n to the left, all other terms to the right
-n=-20
n=-20/-1
n=+20
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