-9+7u=7u-9

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



-9+7u=7u-9

We move all terms to the left:

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

We get rid of parentheses

7u-7u+9-9=0

We add all the numbers together, and all the variables

=0

u=0/1

u=0

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