-9+4u=3+8u

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Solution for -9+4u=3+8u equation: 



-9+4u=3+8u

We move all terms to the left:

-9+4u-(3+8u)=0

We add all the numbers together, and all the variables

4u-(8u+3)-9=0

We get rid of parentheses

4u-8u-3-9=0

We add all the numbers together, and all the variables

-4u-12=0

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

-4u=12

u=12/-4

u=-3

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