y=140/x

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Solution for y=140/x equation: 


D( x )

x = 0

x = 0

x = 0

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

y = 140/x // - 140/x

y-(140/x) = 0

y-140*x^-1 = 0

-140*x^-1 = -y // : -140

x^-1 = y/140

-1 < 0

1/(x^1) = y/140 // * x^1

1 = x^1*(y/140) // : y/140

140*y^-1 = x^1

x = 140*y^-1

x = 140*y^-1

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