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q in (-oo:+oo)
-3 = -((1/2)*q)-11 // + -((1/2)*q)-11
(1/2)*q-3+11 = 0
1/2*q+8 = 0 // - 8
1/2*q = -8 // : 1/2
q = -8/1/2
q = -16
q = -16
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