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n in (-oo:+oo)
3/8 = n/56 // - n/56
3/8-(n/56) = 0
3/8-1/56*n = 0 // - 3/8
-1/56*n = -3/8 // : -1/56
n = -3/8/(-1/56)
n = 21
n = 21
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