21-17u=-642

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Solution for 21-17u=-642 equation: 



21-17u=-642

We move all terms to the left:

21-17u-(-642)=0

We add all the numbers together, and all the variables

-17u+663=0

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

-17u=-663

u=-663/-17

u=+39

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