u+21=5u

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Solution for u+21=5u equation: 



u+21=5u

We move all terms to the left:

u+21-(5u)=0

We add all the numbers together, and all the variables

-4u+21=0

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

-4u=-21

u=-21/-4

u=5+1/4

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