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D( x )
(6*x^1)/7 = 0
(6*x^1)/7 = 0
(6*x^1)/7 = 0
(6*x)/7 = 0
6/7*x = 0 // : 6/7
x = 0
x in (-oo:0) U (0:+oo)
((30*x^1)/4)/((6*x^1)/7) = 0
((30*x)/4)/((6*x)/7) = 0
35/4 = 0
x belongs to the empty set
x belongs to the empty set
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