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t in (-oo:+oo)
(1/5)*(8*t-9) = t+9/10 // - t+9/10
(1/5)*(8*t-9)-t-(9/10) = 0
(1/5)*(8*t-9)-t-9/10 = 0
1/5*(8*t-9)-t-9/10 = 0
(1/5*10*(8*t-9))/10+(10*(-t))/10-9/10 = 0
1/5*10*(8*t-9)+10*(-t)-9 = 0
6*t-18-9 = 0
6*t-27 = 0
(6*t-27)/10 = 0
(6*t-27)/10 = 0 // * 10
6*t-27 = 0
6*t-27 = 0 // + 27
6*t = 27 // : 6
t = 27/6
t = 9/2
t = 9/2
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