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t in (-oo:+oo)
(3/4)*(t+6) = (1/2)*(4*t-1)-(4*(5*t+1)) // - (1/2)*(4*t-1)-(4*(5*t+1))
(3/4)*(t+6)-((1/2)*(4*t-1))+4*(5*t+1) = 0
(3/4)*(t+6)+(-1/2)*(4*t-1)+4*(5*t+1) = 0
3/4*(t+6)-1/2*(4*t-1)+4*(5*t+1) = 0
3/4*(t+6)-1/2*(4*t-1)+4*(5*t+1) = 0
20*t-5/4*t+4+5 = 0
75/4*t+9 = 0
75/4*t+9 = 0
75/4*t+9 = 0 // - 9
75/4*t = -9 // : 75/4
t = -9/75/4
t = -12/25
t = -12/25
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