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D( x )
3*x-20 = 0
3*x-20 = 0
3*x-20 = 0
3*x-20 = 0 // + 20
3*x = 20 // : 3
x = 20/3
x in (-oo:20/3) U (20/3:+oo)
(7*x-19)/(3*x-20) = 0
7*x-19 = 0 // + 19
7*x = 19 // : 7
x = 19/7
x = 19/7
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