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t in (-oo:+oo)
(1/2)*(6*t-9) = (9/2)*t-t+9/4 // - (9/2)*t-t+9/4
(1/2)*(6*t-9)-((9/2)*t)+t-(9/4) = 0
(1/2)*(6*t-9)+(-9/2)*t+t-9/4 = 0
1/2*(6*t-9)+(-9*t)/2+t-9/4 = 0
(1/2*2*4*(6*t-9))/(2*4)+(-9*4*t)/(2*4)+(2*4*t)/(2*4)+(-9*2)/(2*4) = 0
1/2*2*4*(6*t-9)-9*4*t+2*4*t-9*2 = 0
8*t-12*t-36-18 = 0
-4*t-36-18 = 0
-4*t-54 = 0
(-4*t-54)/(2*4) = 0
(-4*t-54)/(2*4) = 0 // * 2*4
-4*t-54 = 0
-4*t-54 = 0 // + 54
-4*t = 54 // : -4
t = 54/(-4)
t = -27/2
t = -27/2
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