210=99-u

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Solution for 210=99-u equation: 



210=99-u

We move all terms to the left:

210-(99-u)=0

We add all the numbers together, and all the variables

-(-1u+99)+210=0

We get rid of parentheses

1u-99+210=0

We add all the numbers together, and all the variables

u+111=0

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

u=-111

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