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0=20+5n
We move all terms to the left:
0-(20+5n)=0
We add all the numbers together, and all the variables
-(5n+20)+0=0
We add all the numbers together, and all the variables
-(5n+20)=0
We get rid of parentheses
-5n-20=0
We move all terms containing n to the left, all other terms to the right
-5n=20
n=20/-5
n=-4
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