6u-21=-u

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Solution for 6u-21=-u equation: 



6u-21=-u

We move all terms to the left:

6u-21-(-u)=0

We add all the numbers together, and all the variables

6u-(-1u)-21=0

We get rid of parentheses

6u+1u-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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