8u=9u-4

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Solution for 8u=9u-4 equation: 



8u=9u-4

We move all terms to the left:

8u-(9u-4)=0

We get rid of parentheses

8u-9u+4=0

We add all the numbers together, and all the variables

-1u+4=0

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

-u=-4

u=-4/-1

u=+4

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