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t in (-oo:+oo)
(t+3)/2 = 7 // - 7
(t+3)/2-7 = 0
(t+3)/2+(-7*2)/2 = 0
t-7*2+3 = 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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