14/15=4.2/y

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Solution for 14/15=4.2/y equation: 


D( y )

y = 0

y = 0

y = 0

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

14/15 = 4.2/y // - 4.2/y

14/15-(4.2/y) = 0

14/15-4.2*y^-1 = 0

-4.2*y^-1 = -14/15 // : -4.2

y^-1 = 0.22222222

-1 < 0

1/(y^1) = 0.22222222 // * y^1

1 = 0.22222222*y^1 // : 0.22222222

4.50000005 = y^1

y = 4.50000005

y = 4.50000005

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