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t in (-oo:+oo)
(1/4)*(9*t-9) = t+9/8 // - t+9/8
(1/4)*(9*t-9)-t-(9/8) = 0
(1/4)*(9*t-9)-t-9/8 = 0
1/4*(9*t-9)-t-9/8 = 0
(1/4*8*(9*t-9))/8+(8*(-t))/8-9/8 = 0
1/4*8*(9*t-9)+8*(-t)-9 = 0
10*t-18-9 = 0
10*t-27 = 0
(10*t-27)/8 = 0
(10*t-27)/8 = 0 // * 8
10*t-27 = 0
10*t-27 = 0 // + 27
10*t = 27 // : 10
t = 27/10
t = 27/10
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