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q in (-oo:+oo)
(q-9)/4+(9+12)/4 = 1/4 // - 1/4
(q-9)/4+(9+12)/4-(1/4) = 0
(q-9)/4+(9+12)/4-1/4 = 0
(q-9)/4+21/4-1/4 = 0
q-9-1+21 = 0
q-1+12 = 0
q+11 = 0
(q+11)/4 = 0
(q+11)/4 = 0 // * 4
q+11 = 0
q+11 = 0 // - 11
q = -11
q = -11
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