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D( t )
5*t+15 = 0
3*t-6 = 0
5*t+15 = 0
5*t+15 = 0
5*t+15 = 0 // - 15
5*t = -15 // : 5
t = -15/5
t = -3
3*t-6 = 0
3*t-6 = 0
3*t-6 = 0 // + 6
3*t = 6 // : 3
t = 6/3
t = 2
t in (-oo:-3) U (-3:2) U (2:+oo)
5/(3*t-6)-(2/(5*t+15)) = 0
5/(3*t-6)-2*(5*t+15)^-1 = 0
5/(3*t-6)-2/(5*t+15) = 0
(5*(5*t+15))/((3*t-6)*(5*t+15))+(-2*(3*t-6))/((3*t-6)*(5*t+15)) = 0
5*(5*t+15)-2*(3*t-6) = 0
19*t+87 = 0
(19*t+87)/((3*t-6)*(5*t+15)) = 0
(19*t+87)/((3*t-6)*(5*t+15)) = 0 // * (3*t-6)*(5*t+15)
19*t+87 = 0
19*t+87 = 0 // - 87
19*t = -87 // : 19
t = -87/19
t = -87/19
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