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n in (-oo:+oo)
n/72 = 2/4 // - 2/4
n/72-(2/4) = 0
n/72-1/2 = 0
1/72*n-1/2 = 0 // + 1/2
1/72*n = 1/2 // : 1/72
n = 1/2/1/72
n = 36
n = 36
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