18u-81=19u-91

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Solution for 18u-81=19u-91 equation: 



18u-81=19u-91

We move all terms to the left:

18u-81-(19u-91)=0

We get rid of parentheses

18u-19u+91-81=0

We add all the numbers together, and all the variables

-1u+10=0

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

-u=-10

u=-10/-1

u=+10

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