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q in (-oo:+oo)
(3/5)*q-(12/5) = 2*q // - 2*q
(3/5)*q-(2*q)-(12/5) = 0
(3/5)*q-2*q-12/5 = 0
-7/5*q-12/5 = 0 // + 12/5
-7/5*q = 12/5 // : -7/5
q = 12/5/(-7/5)
q = -12/7
q = -12/7
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