90=-10n+20

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Solution for 90=-10n+20 equation: 



90=-10n+20

We move all terms to the left:

90-(-10n+20)=0

We get rid of parentheses

10n-20+90=0

We add all the numbers together, and all the variables

10n+70=0

We move all terms containing n to the left, all other terms to the right

10n=-70

n=-70/10

n=-7

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