290=223-u

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Solution for 290=223-u equation: 



290=223-u

We move all terms to the left:

290-(223-u)=0

We add all the numbers together, and all the variables

-(-1u+223)+290=0

We get rid of parentheses

1u-223+290=0

We add all the numbers together, and all the variables

u+67=0

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

u=-67

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