21+5u=-2u

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Solution for 21+5u=-2u equation: 



21+5u=-2u

We move all terms to the left:

21+5u-(-2u)=0

We get rid of parentheses

5u+2u+21=0

We add all the numbers together, and all the variables

7u+21=0

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

7u=-21

u=-21/7

u=-3

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