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q in (-oo:+oo)
3 = (18/11)*q // - (18/11)*q
3-((18/11)*q) = 0
(-18/11)*q+3 = 0
3-18/11*q = 0 // - 3
-18/11*q = -3 // : -18/11
q = -3/(-18/11)
q = 11/6
q = 11/6
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