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-2+n/20=-1
We move all terms to the left:
-2+n/20-(-1)=0
We add all the numbers together, and all the variables
n/20-1=0
We multiply all the terms by the denominator
n-1*20=0
We add all the numbers together, and all the variables
n-20=0
We move all terms containing n to the left, all other terms to the right
n=20
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