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t in (-oo:+oo)
(t-4)/7 = 2 // - 2
(t-4)/7-2 = 0
(t-4)/7+(-2*7)/7 = 0
t-2*7-4 = 0
t-18 = 0
(t-18)/7 = 0
(t-18)/7 = 0 // * 7
t-18 = 0
t-18 = 0 // + 18
t = 18
t = 18
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