-21=4+-5u

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Solution for -21=4+-5u equation: 



-21=4+-5u

We move all terms to the left:

-21-(4+-5u)=0

We add all the numbers together, and all the variables

-(-5u)-21=0

We get rid of parentheses

5u-21=0

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

5u=21

u=21/5

u=4+1/5

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