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q in (-oo:+oo)
4 = (-9/2)*q // - (-9/2)*q
4-((-9/2)*q) = 0
(9/2)*q+4 = 0
9/2*q+4 = 0 // - 4
9/2*q = -4 // : 9/2
q = -4/9/2
q = -8/9
q = -8/9
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