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t in (-oo:+oo)
(4/5)*t+8 = 28/5 // - 28/5
(4/5)*t-(28/5)+8 = 0
(4/5)*t-28/5+8 = 0
4/5*t+12/5 = 0 // - 12/5
4/5*t = -12/5 // : 4/5
t = -12/5/4/5
t = -3
t = -3
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