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t in (-oo:+oo)
(1/2)*t+(2/3)*t-(3/5) = 17/30 // - 17/30
(1/2)*t+(2/3)*t-(3/5)-(17/30) = 0
(1/2)*t+(2/3)*t-3/5-17/30 = 0
7/6*t-7/6 = 0 // + 7/6
7/6*t = 7/6 // : 7/6
t = 7/6/7/6
t = 1
t = 1
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