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n in (-oo:+oo)
n/4 = 20/16 // - 20/16
n/4-(20/16) = 0
n/4-5/4 = 0
1/4*n-5/4 = 0 // + 5/4
1/4*n = 5/4 // : 1/4
n = 5/4/1/4
n = 5
n = 5
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