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n in (-oo:+oo)
15/27 = n/10 // - n/10
15/27-(n/10) = 0
5/9-1/10*n = 0 // - 5/9
-1/10*n = -5/9 // : -1/10
n = -5/9/(-1/10)
n = 50/9
n = 50/9
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