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D( x )
12*x^4*y^5*z^7 = 0
12*x^4*y^5*z^7 = 0
12*x^4*y^5*z^7 = 0
12*x^4*y^5*z^7 = 0 // : 12*y^5*z^7
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(-8*x^2*y^8*z^7)/(12*x^4*y^5*z^7) = 0
-2/3*x^-2*y^3 = 0 // : -2/3*y^3
x^-2 = 0
x należy do O
x belongs to the empty set
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