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t in (-oo:+oo)
(3/5)*t-(5*t)+1/2 = -17/10 // + -17/10
(3/5)*t-(5*t)+1/2-(-17/10) = 0
(3/5)*t-5*t+1/2+17/10 = 0
11/5-22/5*t = 0 // - 11/5
-22/5*t = -11/5 // : -22/5
t = -11/5/(-22/5)
t = 1/2
t = 1/2
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