21=2u+5

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Solution for 21=2u+5 equation: 



21=2u+5

We move all terms to the left:

21-(2u+5)=0

We get rid of parentheses

-2u-5+21=0

We add all the numbers together, and all the variables

-2u+16=0

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

-2u=-16

u=-16/-2

u=+8

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