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t in (-oo:+oo)
(1/4)*(12*t+24) = (3/4)*t+39/2 // - (3/4)*t+39/2
(1/4)*(12*t+24)-((3/4)*t)-(39/2) = 0
(1/4)*(12*t+24)+(-3/4)*t-39/2 = 0
1/4*(12*t+24)+(-3*t)/4-39/2 = 0
(1/4*2*4*(12*t+24))/(2*4)+(-3*2*t)/(2*4)+(-39*4)/(2*4) = 0
1/4*2*4*(12*t+24)-3*2*t-39*4 = 0
18*t-156+48 = 0
18*t-108 = 0
(18*t-108)/(2*4) = 0
(18*t-108)/(2*4) = 0 // * 2*4
18*t-108 = 0
18*t-108 = 0 // + 108
18*t = 108 // : 18
t = 108/18
t = 6
t = 6
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