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q in (-oo:+oo)
10/8 = q/16 // - q/16
10/8-(q/16) = 0
5/4-1/16*q = 0 // - 5/4
-1/16*q = -5/4 // : -1/16
q = -5/4/(-1/16)
q = 20
q = 20
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