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D( a )
3*a = 0
6*a = 0
a-6 = 0
3*a = 0
3*a = 0
3*a = 0 // : 3
a = 0
6*a = 0
6*a = 0
6*a = 0 // : 6
a = 0
a-6 = 0
a-6 = 0
a-6 = 0 // + 6
a = 6
a in (-oo:0) U (0:6) U (6:+oo)
(((6*a-7)/(3*a))/(a-6))/(6*a) = 0
(6*a-7)/(3*6*a*a*(a-6)) = 0
6*a-7 = 0 // + 7
6*a = 7 // : 6
a = 7/6
a = 7/6
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