21/12=7/y

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Solution for 21/12=7/y equation: 


D( y )

y = 0

y = 0

y = 0

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

21/12 = 7/y // - 7/y

21/12-(7/y) = 0

21/12-7*y^-1 = 0

-7*y^-1 = -7/4 // : -7

y^-1 = 1/4

-1 < 0

1/(y^1) = 1/4 // * y^1

1 = 1/4*y^1 // : 1/4

4 = y^1

y = 4

y = 4

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