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D( x )
6*x-15 = 0
6*x-15 = 0
6*x-15 = 0
6*x-15 = 0 // + 15
6*x = 15 // : 6
x = 15/6
x = 5/2
x in (-oo:5/2) U (5/2:+oo)
(3*x-18)/(6*x-15) = 0
3*x-18 = 0 // + 18
3*x = 18 // : 3
x = 18/3
x = 6
x = 6
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