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t in (-oo:+oo)
(t-9)/11 = 12/5 // - 12/5
(t-9)/11-(12/5) = 0
(t-9)/11-12/5 = 0
(5*(t-9))/(5*11)+(-12*11)/(5*11) = 0
5*(t-9)-12*11 = 0
5*t-177 = 0
(5*t-177)/(5*11) = 0
(5*t-177)/(5*11) = 0 // * 5*11
5*t-177 = 0
5*t-177 = 0 // + 177
5*t = 177 // : 5
t = 177/5
t = 177/5
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