-9u=-8u-4

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Solution for -9u=-8u-4 equation: 



-9u=-8u-4

We move all terms to the left:

-9u-(-8u-4)=0

We get rid of parentheses

-9u+8u+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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