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t in (-oo:+oo)
(3/5)*(t+4) = (1/4)*(2*t-6) // - (1/4)*(2*t-6)
(3/5)*(t+4)-((1/4)*(2*t-6)) = 0
(3/5)*(t+4)+(-1/4)*(2*t-6) = 0
3/5*(t+4)-1/4*(2*t-6) = 0
3/5*(t+4)-1/4*(2*t-6) = 0
1/10*t+39/10 = 0
1/10*t+39/10 = 0
1/10*t+39/10 = 0 // - 39/10
1/10*t = -39/10 // : 1/10
t = -39/10/1/10
t = -39
t = -39
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