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q in (-oo:+oo)
(100-q)/2 = 1250 // - 1250
(100-q)/2-1250 = 0
(100-q)/2+(-1250*2)/2 = 0
100-q-1250*2 = 0
-q-2400 = 0
(-q-2400)/2 = 0
(-q-2400)/2 = 0 // * 2
-q-2400 = 0
-q-2400 = 0 // + 2400
-q = 2400 // * -1
q = -2400
q = -2400
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