7u=9u+4

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Solution for 7u=9u+4 equation: 



7u=9u+4

We move all terms to the left:

7u-(9u+4)=0

We get rid of parentheses

7u-9u-4=0

We add all the numbers together, and all the variables

-2u-4=0

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

-2u=4

u=4/-2

u=-2

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