72=9-7u

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Solution for 72=9-7u equation: 



72=9-7u

We move all terms to the left:

72-(9-7u)=0

We add all the numbers together, and all the variables

-(-7u+9)+72=0

We get rid of parentheses

7u-9+72=0

We add all the numbers together, and all the variables

7u+63=0

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

7u=-63

u=-63/7

u=-9

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