21=-3/8u

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Solution for 21=-3/8u equation: 



21=-3/8u

We move all terms to the left:

21-(-3/8u)=0



Domain of the equation: 8u)!=0

u!=0/1

u!=0

u∈R



We get rid of parentheses

3/8u+21=0

We multiply all the terms by the denominator


21*8u+3=0

Wy multiply elements

168u+3=0

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

168u=-3

u=-3/168

u=-1/56

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