21=-7/2y

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Solution for 21=-7/2y equation: 



21=-7/2y

We move all terms to the left:

21-(-7/2y)=0



Domain of the equation: 2y)!=0

y!=0/1

y!=0

y∈R



We get rid of parentheses

7/2y+21=0

We multiply all the terms by the denominator


21*2y+7=0

Wy multiply elements

42y+7=0

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

42y=-7

y=-7/42

y=-1/6

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