21-2u=3

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Solution for 21-2u=3 equation: 



21-2u=3

We move all terms to the left:

21-2u-(3)=0

We add all the numbers together, and all the variables

-2u+18=0

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

-2u=-18

u=-18/-2

u=+9

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