-21=u-48

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Solution for -21=u-48 equation: 



-21=u-48

We move all terms to the left:

-21-(u-48)=0

We get rid of parentheses

-u+48-21=0

We add all the numbers together, and all the variables

-1u+27=0

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

-u=-27

u=-27/-1

u=+27

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