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q in (-oo:+oo)
4/10 = q/5 // - q/5
4/10-(q/5) = 0
2/5-1/5*q = 0 // - 2/5
-1/5*q = -2/5 // : -1/5
q = -2/5/(-1/5)
q = 2
q = 2
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