-40=9-7u

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Solution for -40=9-7u equation: 



-40=9-7u

We move all terms to the left:

-40-(9-7u)=0

We add all the numbers together, and all the variables

-(-7u+9)-40=0

We get rid of parentheses

7u-9-40=0

We add all the numbers together, and all the variables

7u-49=0

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

7u=49

u=49/7

u=7

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