y=(39-x)/x

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Solution for y=(39-x)/x equation: 


D( x )

x = 0

x = 0

x = 0

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

y = (39-x)/x // - (39-x)/x

y-((39-x)/x) = 0

(-1*(39-x))/x+y = 0

(-1*(39-x))/x+(x*y)/x = 0

x*y-1*(39-x) = 0

x+x*y-39 = 0

x+x*y-39 = 0

x*y-39 = 0 // + 39

x*y = 39 // : y

x = 39/y

x-39*y^-1 = 0

(x-39*y^-1)/x = 0

(x-39*y^-1)/x = 0 // * x

x-39*y^-1 = 0

x-39*y^-1 = 0 // + -39*y^-1

x = -(-39*y^-1)

x = 39*y^-1

x = 39*y^-1

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