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n in (-oo:+oo)
9/6 = n/4 // - n/4
9/6-(n/4) = 0
3/2-1/4*n = 0 // - 3/2
-1/4*n = -3/2 // : -1/4
n = -3/2/(-1/4)
n = 6
n = 6
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