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q in (-oo:+oo)
q/2 < 4 // - 4
q/2-4 < 0
1/2*q-4 < 0 // + 4
1/2*q < 4 // : 1/2
q < 4/1/2
q < 8
q in (-oo:8)
(-oo:8)
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