-91=9u-1

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Solution for -91=9u-1 equation: 



-91=9u-1

We move all terms to the left:

-91-(9u-1)=0

We get rid of parentheses

-9u+1-91=0

We add all the numbers together, and all the variables

-9u-90=0

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

-9u=90

u=90/-9

u=-10

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