-20=7-9u

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Solution for -20=7-9u equation: 



-20=7-9u

We move all terms to the left:

-20-(7-9u)=0

We add all the numbers together, and all the variables

-(-9u+7)-20=0

We get rid of parentheses

9u-7-20=0

We add all the numbers together, and all the variables

9u-27=0

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

9u=27

u=27/9

u=3

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