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D( x )
3*x-15 = 0
3*x-15 = 0
3*x-15 = 0
3*x-15 = 0 // + 15
3*x = 15 // : 3
x = 15/3
x = 5
x in (-oo:5) U (5:+oo)
(5/(3*x-15))*(6*x-30)^7 = 0
(5*(6*x-30)^7)/(3*x-15) = 0
( 5 )
5 = 0
x belongs to the empty set
( 6*x-30 )
6*x-30 = 0 // + 30
6*x = 30 // : 6
x = 30/6
x = 5
x in { 5}
x belongs to the empty set
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