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q in (-oo:+oo)
10/19 = q/15 // - q/15
10/19-(q/15) = 0
10/19-1/15*q = 0 // - 10/19
-1/15*q = -10/19 // : -1/15
q = -10/19/(-1/15)
q = 150/19
q = 150/19
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