9+5u=7u-9

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Solution for 9+5u=7u-9 equation: 



9+5u=7u-9

We move all terms to the left:

9+5u-(7u-9)=0

We get rid of parentheses

5u-7u+9+9=0

We add all the numbers together, and all the variables

-2u+18=0

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

-2u=-18

u=-18/-2

u=+9

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