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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)-(t/5)-(5/20)+3 = 0
(2*t)/15-3*t-(t/5)-1/4+3 = 0
11/4-46/15*t = 0 // - 11/4
-46/15*t = -11/4 // : -46/15
t = -11/4/(-46/15)
t = 165/184
t = 165/184
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