42/10=21/y

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Solution for 42/10=21/y equation: 


D( y )

y = 0

y = 0

y = 0

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

42/10 = 21/y // - 21/y

42/10-(21/y) = 0

42/10-21*y^-1 = 0

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

y^-1 = 1/5

-1 < 0

1/(y^1) = 1/5 // * y^1

1 = 1/5*y^1 // : 1/5

5 = y^1

y = 5

y = 5

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