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