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D( x )
y^2 = 0
x*((9*y)/7) = 0
y^2 = 0
y^2 = 0
y^2 = 0
x należy do R
x*((9*y)/7) = 0
x*((9*y)/7) = 0
9/7*x*y = 0 // : 9/7*y
x = 0
x belongs to the empty set
((6*x)/(y^2))/(x*((9*y)/7)) = 0
x belongs to the empty set
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