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D( x )
30*x-8 = 0
30*x-8 = 0
30*x-8 = 0
30*x-8 = 0 // + 8
30*x = 8 // : 30
x = 8/30
x = 4/15
x in (-oo:4/15) U (4/15:+oo)
(10*x-1)/(30*x-8) = 0
10*x-1 = 0 // + 1
10*x = 1 // : 10
x = 1/10
x = 1/10
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