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n in (-oo:+oo)
3/4 = n/16 // - n/16
3/4-(n/16) = 0
3/4-1/16*n = 0 // - 3/4
-1/16*n = -3/4 // : -1/16
n = -3/4/(-1/16)
n = 12
n = 12
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