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