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n in (-oo:+oo)
18/72 = n/4 // - n/4
18/72-(n/4) = 0
1/4-1/4*n = 0 // - 1/4
-1/4*n = -1/4 // : -1/4
n = -1/4/(-1/4)
n = 1
n = 1
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