9u-7u-u=9

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Solution for 9u-7u-u=9 equation: 



9u-7u-u=9

We move all terms to the left:

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

We add all the numbers together, and all the variables

u-9=0

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

u=9

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