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t in (-oo:+oo)
-9/2 = (-9*t)/2-((1/4)*(10*t-2)) // - (-9*t)/2-((1/4)*(10*t-2))
(1/4)*(10*t-2)-((-9*t)/2)-9/2 = 0
(1/4)*(10*t-2)+(9/2)*t-9/2 = 0
1/4*(10*t-2)+(9*t)/2-9/2 = 0
(1/4*2*(10*t-2))/2+(9*t)/2-9/2 = 0
1/4*2*(10*t-2)+9*t-9 = 0
14*t-9-1 = 0
14*t-10 = 0
(14*t-10)/2 = 0
(14*t-10)/2 = 0 // * 2
14*t-10 = 0
14*t-10 = 0 // + 10
14*t = 10 // : 14
t = 10/14
t = 5/7
t = 5/7
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