21=u+51

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Solution for 21=u+51 equation: 



21=u+51

We move all terms to the left:

21-(u+51)=0

We get rid of parentheses

-u-51+21=0

We add all the numbers together, and all the variables

-1u-30=0

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

-u=30

u=30/-1

u=-30

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