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q in (-oo:+oo)
(1*q)/16 = 4 // - 4
(1*q)/16-4 = 0
q/16-4 = 0
1/16*q-4 = 0 // + 4
1/16*q = 4 // : 1/16
q = 4/1/16
q = 64
q = 64
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