7u-4=8u

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Solution for 7u-4=8u equation: 



7u-4=8u

We move all terms to the left:

7u-4-(8u)=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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