28x^-3y/7x^-1y^3

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Solution for 28x^-3y/7x^-1y^3 equation: 


D( x )

x = 0

x = 0

x = 0

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

x^-1*((28*x^-3*y)/7)*y^3 = 0

4*x^-4*y^4 = 0 // : 4*y^4

x^-4 = 0

x należy do O

x belongs to the empty set

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