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t in (-oo:+oo)
(t-5)/5 = (t+4)/8 // - (t+4)/8
(t-5)/5-((t+4)/8) = 0
(t-5)/5+(-1*(t+4))/8 = 0
(8*(t-5))/(5*8)+(-1*5*(t+4))/(5*8) = 0
8*(t-5)-1*5*(t+4) = 0
3*t-60 = 0
(3*t-60)/(5*8) = 0
(3*t-60)/(5*8) = 0 // * 5*8
3*t-60 = 0
3*t-60 = 0 // + 60
3*t = 60 // : 3
t = 60/3
t = 20
t = 20
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