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n in (-oo:+oo)
18/36 = n/8 // - n/8
18/36-(n/8) = 0
1/2-1/8*n = 0 // - 1/2
-1/8*n = -1/2 // : -1/8
n = -1/2/(-1/8)
n = 4
n = 4
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