-40=2-7u

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Solution for -40=2-7u equation: 



-40=2-7u

We move all terms to the left:

-40-(2-7u)=0

We add all the numbers together, and all the variables

-(-7u+2)-40=0

We get rid of parentheses

7u-2-40=0

We add all the numbers together, and all the variables

7u-42=0

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

7u=42

u=42/7

u=6

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