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t in (-oo:+oo)
(1/6)*(9*t-6) = (t+6)/12 // - (t+6)/12
(1/6)*(9*t-6)-((t+6)/12) = 0
1/6*(9*t-6)+(-1*(t+6))/12 = 0
(1/6*12*(9*t-6))/12+(-1*(t+6))/12 = 0
1/6*12*(9*t-6)-1*(t+6) = 0
17*t-18 = 0
(17*t-18)/12 = 0
(17*t-18)/12 = 0 // * 12
17*t-18 = 0
17*t-18 = 0 // + 18
17*t = 18 // : 17
t = 18/17
t = 18/17
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