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21=7/4y

We move all terms to the left:

21-(7/4y)=0

Domain of the equation: 4y)!=0We add all the numbers together, and all the variables

y!=0/1

y!=0

y∈R

-(+7/4y)+21=0

We get rid of parentheses

-7/4y+21=0

We multiply all the terms by the denominator

21*4y-7=0

Wy multiply elements

84y-7=0

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

84y=7

y=7/84

y=1/12

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