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q in (-oo:+oo)
12 = (-1/2)*q+8 // - (-1/2)*q+8
12-((-1/2)*q)-8 = 0
(1/2)*q-8+12 = 0
1/2*q+4 = 0 // - 4
1/2*q = -4 // : 1/2
q = -4/1/2
q = -8
q = -8
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