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n in (-oo:+oo)
3/27 = n/90 // - n/90
3/27-(n/90) = 0
1/9-1/90*n = 0 // - 1/9
-1/90*n = -1/9 // : -1/90
n = -1/9/(-1/90)
n = 10
n = 10
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