20-4u=u

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Solution for 20-4u=u equation: 



20-4u=u

We move all terms to the left:

20-4u-(u)=0

We add all the numbers together, and all the variables

-5u+20=0

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

-5u=-20

u=-20/-5

u=+4

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