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t in (-oo:+oo)
(1/6)*(7*t-9) = (t+9)/12 // - (t+9)/12
(1/6)*(7*t-9)-((t+9)/12) = 0
1/6*(7*t-9)+(-1*(t+9))/12 = 0
(1/6*12*(7*t-9))/12+(-1*(t+9))/12 = 0
1/6*12*(7*t-9)-1*(t+9) = 0
13*t-27 = 0
(13*t-27)/12 = 0
(13*t-27)/12 = 0 // * 12
13*t-27 = 0
13*t-27 = 0 // + 27
13*t = 27 // : 13
t = 27/13
t = 27/13
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