2.1/42=7/y

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Solution for 2.1/42=7/y equation: 


D( y )

y = 0

y = 0

y = 0

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

2.1/42 = 7/y // - 7/y

2.1/42-(7/y) = 0

2.1/42-7*y^-1 = 0

-7*y^-1 = -0.05 // : -7

y^-1 = 0.00714286

-1 < 0

1/(y^1) = 0.00714286 // * y^1

1 = 0.00714286*y^1 // : 0.00714286

139.999944 = y^1

y = 139.999944

y = 139.999944

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