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n in (-oo:+oo)
6/4 = n/28 // - n/28
6/4-(n/28) = 0
3/2-1/28*n = 0 // - 3/2
-1/28*n = -3/2 // : -1/28
n = -3/2/(-1/28)
n = 42
n = 42
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