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q in (-oo:+oo)
16 = (-1/2)*(q+2) // - (-1/2)*(q+2)
16-((-1/2)*(q+2)) = 0
(1/2)*(q+2)+16 = 0
1/2*(q+2)+16 = 0
1/2*(q+2)+16 = 0
1/2*q+17 = 0
1/2*q+17 = 0
1/2*q+17 = 0 // - 17
1/2*q = -17 // : 1/2
q = -17/1/2
q = -34
q = -34
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