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t in (-oo:+oo)
(3*t+7)/4 = -(t/8) // + t/8
(3*t+7)/4+t/8 = 0
(8*(3*t+7))/(4*8)+(4*t)/(4*8) = 0
8*(3*t+7)+4*t = 0
28*t+56 = 0
(28*t+56)/(4*8) = 0
(28*t+56)/(4*8) = 0 // * 4*8
28*t+56 = 0
28*t+56 = 0 // - 56
28*t = -56 // : 28
t = -56/28
t = -2
t = -2
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