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t in (-oo:+oo)
(1/2)*(6*t+9) = t+9/4 // - t+9/4
(1/2)*(6*t+9)-t-(9/4) = 0
(1/2)*(6*t+9)-t-9/4 = 0
1/2*(6*t+9)-t-9/4 = 0
(1/2*4*(6*t+9))/4+(4*(-t))/4-9/4 = 0
1/2*4*(6*t+9)+4*(-t)-9 = 0
8*t-9+18 = 0
8*t+9 = 0
(8*t+9)/4 = 0
(8*t+9)/4 = 0 // * 4
8*t+9 = 0
8*t+9 = 0 // - 9
8*t = -9 // : 8
t = -9/8
t = -9/8
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