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t in (-oo:+oo)
(2/3)*t+(5/6)*t+4 = 17/4 // - 17/4
(2/3)*t+(5/6)*t-(17/4)+4 = 0
(2/3)*t+(5/6)*t-17/4+4 = 0
3/2*t-1/4 = 0 // + 1/4
3/2*t = 1/4 // : 3/2
t = 1/4/3/2
t = 1/6
t = 1/6
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