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n in (-oo:+oo)
2/10 = n/50 // - n/50
2/10-(n/50) = 0
1/5-1/50*n = 0 // - 1/5
-1/50*n = -1/5 // : -1/50
n = -1/5/(-1/50)
n = 10
n = 10
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