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