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t in (-oo:+oo)
(1/2)*(5*t-7) = (9/2)*t-t-(7/4) // - (9/2)*t-t-(7/4)
(1/2)*(5*t-7)-((9/2)*t)+t+7/4 = 0
(1/2)*(5*t-7)+(-9/2)*t+t+7/4 = 0
1/2*(5*t-7)+(-9*t)/2+t+7/4 = 0
(1/2*2*4*(5*t-7))/(2*4)+(-9*4*t)/(2*4)+(2*4*t)/(2*4)+(2*7)/(2*4) = 0
1/2*2*4*(5*t-7)-9*4*t+2*4*t+2*7 = 0
8*t-16*t-28+14 = 0
14-8*t-28 = 0
-8*t-14 = 0
(-8*t-14)/(2*4) = 0
(-8*t-14)/(2*4) = 0 // * 2*4
-8*t-14 = 0
-8*t-14 = 0 // + 14
-8*t = 14 // : -8
t = 14/(-8)
t = -7/4
t = -7/4
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