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t in (-oo:+oo)
(1/2)*(5*t-9) = t+9/4 // - t+9/4
(1/2)*(5*t-9)-t-(9/4) = 0
(1/2)*(5*t-9)-t-9/4 = 0
1/2*(5*t-9)-t-9/4 = 0
(1/2*4*(5*t-9))/4+(4*(-t))/4-9/4 = 0
1/2*4*(5*t-9)+4*(-t)-9 = 0
6*t-18-9 = 0
6*t-27 = 0
(6*t-27)/4 = 0
(6*t-27)/4 = 0 // * 4
6*t-27 = 0
6*t-27 = 0 // + 27
6*t = 27 // : 6
t = 27/6
t = 9/2
t = 9/2
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