7+8u=u

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Solution for 7+8u=u equation: 



7+8u=u

We move all terms to the left:

7+8u-(u)=0

We add all the numbers together, and all the variables

7u+7=0

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

7u=-7

u=-7/7

u=-1

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