-20=-4/9u

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Solution for -20=-4/9u equation: 



-20=-4/9u

We move all terms to the left:

-20-(-4/9u)=0



Domain of the equation: 9u)!=0

u!=0/1

u!=0

u∈R



We get rid of parentheses

4/9u-20=0

We multiply all the terms by the denominator


-20*9u+4=0

Wy multiply elements

-180u+4=0

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

-180u=-4

u=-4/-180

u=1/45

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