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D( d )
15-d = 0
15-d = 0
15-d = 0
15-d = 0 // - 15
-d = -15 // * -1
d = 15
d in (-oo:15) U (15:+oo)
6.6/(15-d) = 0.6 // - 0.6
6.6/(15-d)-0.6 = 0
6.6/(15-d)+(-0.6*(15-d))/(15-d) = 0
6.6-0.6*(15-d) = 0
0.6*d-2.4 = 0
(0.6*d-2.4)/(15-d) = 0
(0.6*d-2.4)/(15-d) = 0 // * 15-d
0.6*d-2.4 = 0
0.6*d-2.4 = 0 // + 2.4
0.6*d = 2.4 // : 0.6
d = 2.4/0.6
d = 4
d = 4
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