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t in (-oo:+oo)
(1/7)*(8*t-9) = (t+9)/14 // - (t+9)/14
(1/7)*(8*t-9)-((t+9)/14) = 0
1/7*(8*t-9)+(-1*(t+9))/14 = 0
(1/7*14*(8*t-9))/14+(-1*(t+9))/14 = 0
1/7*14*(8*t-9)-1*(t+9) = 0
15*t-27 = 0
(15*t-27)/14 = 0
(15*t-27)/14 = 0 // * 14
15*t-27 = 0
15*t-27 = 0 // + 27
15*t = 27 // : 15
t = 27/15
t = 9/5
t = 9/5
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