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t in (-oo:+oo)
(3*t+6)/10+(5-(2*t))/5 = 6 // - 6
(3*t+6)/10+(5-(2*t))/5-6 = 0
(3*t+6)/10+(5-2*t)/5-6 = 0
(5*(3*t+6))/(5*10)+(10*(5-2*t))/(5*10)+(-6*5*10)/(5*10) = 0
5*(3*t+6)+10*(5-2*t)-6*5*10 = 0
80-5*t-300 = 0
-5*t-220 = 0
(-5*t-220)/(5*10) = 0
(-5*t-220)/(5*10) = 0 // * 5*10
-5*t-220 = 0
-5*t-220 = 0 // + 220
-5*t = 220 // : -5
t = 220/(-5)
t = -44
t = -44
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