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D( t )
11*t+30 = 0
11*t+30 = 0
11*t+30 = 0
11*t+30 = 0 // - 30
11*t = -30 // : 11
t = -30/11
t in (-oo:-30/11) U (-30/11:+oo)
(30*t)/(11*t+30) = 2 // - 2
(30*t)/(11*t+30)-2 = 0
(30*t)/(11*t+30)+(-2*(11*t+30))/(11*t+30) = 0
30*t-2*(11*t+30) = 0
8*t-60 = 0
(8*t-60)/(11*t+30) = 0
(8*t-60)/(11*t+30) = 0 // * 11*t+30
8*t-60 = 0
8*t-60 = 0 // + 60
8*t = 60 // : 8
t = 60/8
t = 15/2
t = 15/2
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