9=4u+21

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Solution for 9=4u+21 equation: 



9=4u+21

We move all terms to the left:

9-(4u+21)=0

We get rid of parentheses

-4u-21+9=0

We add all the numbers together, and all the variables

-4u-12=0

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

-4u=12

u=12/-4

u=-3

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