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q in (-oo:+oo)
q/18 = 90/135 // - 90/135
q/18-(90/135) = 0
q/18-2/3 = 0
1/18*q-2/3 = 0 // + 2/3
1/18*q = 2/3 // : 1/18
q = 2/3/1/18
q = 12
q = 12
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