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t in (-oo:+oo)
(1/4)*(8*t-6) = (t+6)/8 // - (t+6)/8
(1/4)*(8*t-6)-((t+6)/8) = 0
1/4*(8*t-6)+(-1*(t+6))/8 = 0
(1/4*8*(8*t-6))/8+(-1*(t+6))/8 = 0
1/4*8*(8*t-6)-1*(t+6) = 0
15*t-18 = 0
(15*t-18)/8 = 0
(15*t-18)/8 = 0 // * 8
15*t-18 = 0
15*t-18 = 0 // + 18
15*t = 18 // : 15
t = 18/15
t = 6/5
t = 6/5
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