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q in (-oo:+oo)
13/7 = q/18 // - q/18
13/7-(q/18) = 0
13/7-1/18*q = 0 // - 13/7
-1/18*q = -13/7 // : -1/18
q = -13/7/(-1/18)
q = 234/7
q = 234/7
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