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n in (-oo:+oo)
9/4 = n/8 // - n/8
9/4-(n/8) = 0
9/4-1/8*n = 0 // - 9/4
-1/8*n = -9/4 // : -1/8
n = -9/4/(-1/8)
n = 18
n = 18
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