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