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D( x )
6*x^2 = 0
7*y^2 = 0
6*x^2 = 0
6*x^2 = 0
6*x^2 = 0 // : 6
x^2 = 0
x = 0
7*y^2 = 0
7*y^2 = 0
7*y^2 = 0
x należy do R
x belongs to the empty set
((3*x)/(7*y^2))*((49*y^3)/(6*x^2)) = 0
x belongs to the empty set
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