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t in (-oo:+oo)
(2*t)/15-((3*t-5)/20) = t/5-3 // - t/5-3
(2*t)/15-((3*t-5)/20)-(t/5)+3 = 0
(-1*(3*t-5))/20+(2*t)/15-t/5+3 = 0
(-1*5*15*(3*t-5))/(5*15*20)+(2*5*20*t)/(5*15*20)+(15*20*(-t))/(5*15*20)+(3*5*15*20)/(5*15*20) = 0
2*5*20*t-1*5*15*(3*t-5)+15*20*(-t)+3*5*15*20 = 0
375-25*t-300*t+4500 = 0
375-325*t+4500 = 0
4875-325*t = 0
(4875-325*t)/(5*15*20) = 0
(4875-325*t)/(5*15*20) = 0 // * 5*15*20
4875-325*t = 0
4875-325*t = 0 // - 4875
-325*t = -4875 // : -325
t = -4875/(-325)
t = 15
t = 15
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