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q in (-oo:+oo)
q = (3/2)*q-4 // - (3/2)*q-4
q-((3/2)*q)+4 = 0
q+(-3/2)*q+4 = 0
4-1/2*q = 0 // - 4
-1/2*q = -4 // : -1/2
q = -4/(-1/2)
q = 8
q = 8
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