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

140*x^-1+y = 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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