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t in (-oo:+oo)
(1/9)*(3*t-6) = (t+6)/18 // - (t+6)/18
(1/9)*(3*t-6)-((t+6)/18) = 0
1/9*(3*t-6)+(-1*(t+6))/18 = 0
(1/9*18*(3*t-6))/18+(-1*(t+6))/18 = 0
1/9*18*(3*t-6)-1*(t+6) = 0
5*t-18 = 0
(5*t-18)/18 = 0
(5*t-18)/18 = 0 // * 18
5*t-18 = 0
5*t-18 = 0 // + 18
5*t = 18 // : 5
t = 18/5
t = 18/5
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