7=21-2u

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Solution for 7=21-2u equation: 



7=21-2u

We move all terms to the left:

7-(21-2u)=0

We add all the numbers together, and all the variables

-(-2u+21)+7=0

We get rid of parentheses

2u-21+7=0

We add all the numbers together, and all the variables

2u-14=0

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

2u=14

u=14/2

u=7

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