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-91=-1+10n
We move all terms to the left:
-91-(-1+10n)=0
We add all the numbers together, and all the variables
-(10n-1)-91=0
We get rid of parentheses
-10n+1-91=0
We add all the numbers together, and all the variables
-10n-90=0
We move all terms containing n to the left, all other terms to the right
-10n=90
n=90/-10
n=-9
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