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t in (-oo:+oo)
15/11 = t+(3/5)*t+1/5 // - t+(3/5)*t+1/5
15/11-t-((3/5)*t)-(1/5) = 0
(-3/5)*t-t+15/11-1/5 = 0
64/55-8/5*t = 0 // - 64/55
-8/5*t = -64/55 // : -8/5
t = -64/55/(-8/5)
t = 8/11
t = 8/11
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