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t in (-oo:+oo)
(1/2)*(5*t^2-(4*t))-((1/3)*(3*t^2+12*t)) = 0
(1/2)*(5*t^2-4*t)+(-1/3)*(3*t^2+12*t) = 0
1/2*(5*t^2-4*t)-1/3*(3*t^2+12*t) = 0
1/2*(5*t^2-4*t)-1/3*(3*t^2+12*t) = 0
3/2*t^2-6*t = 0
3/2*t^2-6*t = 0
3*t*(1/2*t-2) = 0
1/2*t-2 = 0 // + 2
1/2*t = 2 // : 1/2
t = 2/1/2
t = 4
3*t*(t-4) = 0
3*t*(t-4) = 0
( 3*t )
3*t = 0 // : 3
t = 0
( t-4 )
t-4 = 0 // + 4
t = 4
t in { 0, 4 }
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