21/2y=20

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Solution for 21/2y=20 equation: 



21/2y=20

We move all terms to the left:

21/2y-(20)=0



Domain of the equation: 2y!=0

y!=0/2

y!=0

y∈R



We multiply all the terms by the denominator


-20*2y+21=0

Wy multiply elements

-40y+21=0

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

-40y=-21

y=-21/-40

y=21/40

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