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n in (-oo:+oo)
n/4 = 20/8 // - 20/8
n/4-(20/8) = 0
n/4-5/2 = 0
1/4*n-5/2 = 0 // + 5/2
1/4*n = 5/2 // : 1/4
n = 5/2/1/4
n = 10
n = 10
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