21-4u=9

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Solution for 21-4u=9 equation: 



21-4u=9

We move all terms to the left:

21-4u-(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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