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t in (-oo:+oo)
(8/5)*(t-6) = 0.4 // - 0.4
(8/5)*(t-6)-0.4 = 0
8/5*(t-6)-0.4 = 0
8/5*(t-6)-0.4 = 0
8/5*t-10 = 0
8/5*t-10 = 0
8/5*t-10 = 0 // + 10
8/5*t = 10 // : 8/5
t = 10/8/5
t = 25/4
t = 25/4
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