7u-9=-9+7u

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



7u-9=-9+7u

We move all terms to the left:

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

We add all the numbers together, and all the variables

7u-(7u-9)-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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