81=u+21

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Solution for 81=u+21 equation: 



81=u+21

We move all terms to the left:

81-(u+21)=0

We get rid of parentheses

-u-21+81=0

We add all the numbers together, and all the variables

-1u+60=0

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

-u=-60

u=-60/-1

u=+60

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