-20=-u+5u

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Solution for -20=-u+5u equation: 



-20=-u+5u

We move all terms to the left:

-20-(-u+5u)=0

We add all the numbers together, and all the variables

-(+4u)-20=0

We get rid of parentheses

-4u-20=0

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

-4u=20

u=20/-4

u=-5

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