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q in (-oo:+oo)
15 = 3*q-(9/2) // - 3*q-(9/2)
9/2-(3*q)+15 = 0
9/2-3*q+15 = 0
39/2-3*q = 0 // - 39/2
-3*q = -39/2 // : -3
q = -39/2/(-3)
q = 13/2
q = 13/2
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