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t in (-oo:+oo)
(1/5)*(4*t-9) = t+9/10 // - t+9/10
(1/5)*(4*t-9)-t-(9/10) = 0
(1/5)*(4*t-9)-t-9/10 = 0
1/5*(4*t-9)-t-9/10 = 0
(1/5*10*(4*t-9))/10+(10*(-t))/10-9/10 = 0
1/5*10*(4*t-9)+10*(-t)-9 = 0
-2*t-18-9 = 0
-2*t-27 = 0
(-2*t-27)/10 = 0
(-2*t-27)/10 = 0 // * 10
-2*t-27 = 0
-2*t-27 = 0 // + 27
-2*t = 27 // : -2
t = 27/(-2)
t = -27/2
t = -27/2
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