10-21=3u

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Solution for 10-21=3u equation: 



10-21=3u

We move all terms to the left:

10-21-(3u)=0

We add all the numbers together, and all the variables

-3u-11=0

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

-3u=11

u=11/-3

u=-3+2/3

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