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t in (-oo:+oo)
(1/4)*(4*t-9) = (5/4)*t-((t+9)/8) // - (5/4)*t-((t+9)/8)
(1/4)*(4*t-9)+(t+9)/8-((5/4)*t) = 0
(1/4)*(4*t-9)+(t+9)/8+(-5/4)*t = 0
1/4*(4*t-9)+(t+9)/8+(-5*t)/4 = 0
(1/4*4*8*(4*t-9))/(4*8)+(4*(t+9))/(4*8)+(-5*8*t)/(4*8) = 0
1/4*4*8*(4*t-9)+4*(t+9)-5*8*t = 0
36*t-40*t-36 = 0
-4*t-36 = 0
(-4*t-36)/(4*8) = 0
(-4*t-36)/(4*8) = 0 // * 4*8
-4*t-36 = 0
-4*t-36 = 0 // + 36
-4*t = 36 // : -4
t = 36/(-4)
t = -9
t = -9
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