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n in (-oo:+oo)
n/4 = 18/24 // - 18/24
n/4-(18/24) = 0
n/4-3/4 = 0
1/4*n-3/4 = 0 // + 3/4
1/4*n = 3/4 // : 1/4
n = 3/4/1/4
n = 3
n = 3
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