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q in (-oo:+oo)
q/12 = 9/12 // - 9/12
q/12-(9/12) = 0
q/12-3/4 = 0
1/12*q-3/4 = 0 // + 3/4
1/12*q = 3/4 // : 1/12
q = 3/4/1/12
q = 9
q = 9
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