217=4-u

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Solution for 217=4-u equation: 



217=4-u

We move all terms to the left:

217-(4-u)=0

We add all the numbers together, and all the variables

-(-1u+4)+217=0

We get rid of parentheses

1u-4+217=0

We add all the numbers together, and all the variables

u+213=0

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

u=-213

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