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q in (-oo:+oo)
(2/3)*q-(1/2) = q+1/8 // - q+1/8
(2/3)*q-q-(1/2)-(1/8) = 0
(2/3)*q-q-1/2-1/8 = 0
-1/3*q-5/8 = 0 // + 5/8
-1/3*q = 5/8 // : -1/3
q = 5/8/(-1/3)
q = -15/8
q = -15/8
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