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