21=-3/7y

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Solution for 21=-3/7y equation: 



21=-3/7y

We move all terms to the left:

21-(-3/7y)=0



Domain of the equation: 7y)!=0

y!=0/1

y!=0

y∈R



We get rid of parentheses

3/7y+21=0

We multiply all the terms by the denominator


21*7y+3=0

Wy multiply elements

147y+3=0

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

147y=-3

y=-3/147

y=-1/49

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