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t in (-oo:+oo)
(-1/2)*(t-9)-t-(53/4) = (3/8)*t // - (3/8)*t
(-1/2)*(t-9)-t-((3/8)*t)-(53/4) = 0
(-1/2)*(t-9)-t+(-3/8)*t-53/4 = 0
(-3*t)/8-1/2*(t-9)-t-53/4 = 0
(-1/2*4*8*(t-9))/(4*8)+(4*8*(-t))/(4*8)+(-3*4*t)/(4*8)+(-53*8)/(4*8) = 0
4*8*(-t)-1/2*4*8*(t-9)-3*4*t-53*8 = 0
144-48*t-12*t-424 = 0
144-60*t-424 = 0
-60*t-280 = 0
(-60*t-280)/(4*8) = 0
(-60*t-280)/(4*8) = 0 // * 4*8
-60*t-280 = 0
-60*t-280 = 0 // + 280
-60*t = 280 // : -60
t = 280/(-60)
t = -14/3
t = -14/3
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