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q in (-oo:+oo)
q/16 = 15/6 // - 15/6
q/16-(15/6) = 0
q/16-5/2 = 0
1/16*q-5/2 = 0 // + 5/2
1/16*q = 5/2 // : 1/16
q = 5/2/1/16
q = 40
q = 40
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