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q in (-oo:+oo)
q/18 = 15/20 // - 15/20
q/18-(15/20) = 0
q/18-3/4 = 0
1/18*q-3/4 = 0 // + 3/4
1/18*q = 3/4 // : 1/18
q = 3/4/1/18
q = 27/2
q = 27/2
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