21=3u+12

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Solution for 21=3u+12 equation: 



21=3u+12

We move all terms to the left:

21-(3u+12)=0

We get rid of parentheses

-3u-12+21=0

We add all the numbers together, and all the variables

-3u+9=0

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

-3u=-9

u=-9/-3

u=+3

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