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t in (-oo:+oo)
(7/2)*t = 1/2 // - 1/2
(7/2)*t-(1/2) = 0
(7/2)*t-1/2 = 0
7/2*t-1/2 = 0 // + 1/2
7/2*t = 1/2 // : 7/2
t = 1/2/7/2
t = 1/7
t = 1/7
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