3/5=21/y

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Solution for 3/5=21/y equation: 


D( y )

y = 0

y = 0

y = 0

y in (-oo:0) U (0:+oo)

3/5 = 21/y // - 21/y

3/5-(21/y) = 0

3/5-21*y^-1 = 0

-21*y^-1 = -3/5 // : -21

y^-1 = 1/35

-1 < 0

1/(y^1) = 1/35 // * y^1

1 = 1/35*y^1 // : 1/35

35 = y^1

y = 35

y = 35

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