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D( x )
30*x-1 = 0
30*x-1 = 0
30*x-1 = 0
30*x-1 = 0 // + 1
30*x = 1 // : 30
x = 1/30
x in (-oo:1/30) U (1/30:+oo)
(10*x-6)/(30*x-1) = 0
10*x-6 = 0 // + 6
10*x = 6 // : 10
x = 6/10
x = 3/5
x = 3/5
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