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t in (-oo:+oo)
(1/4)*(4*t+9) = (t+9)/8 // - (t+9)/8
(1/4)*(4*t+9)-((t+9)/8) = 0
1/4*(4*t+9)+(-1*(t+9))/8 = 0
(1/4*8*(4*t+9))/8+(-1*(t+9))/8 = 0
1/4*8*(4*t+9)-1*(t+9) = 0
7*t+9 = 0
(7*t+9)/8 = 0
(7*t+9)/8 = 0 // * 8
7*t+9 = 0
7*t+9 = 0 // - 9
7*t = -9 // : 7
t = -9/7
t = -9/7
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