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n in (-oo:+oo)
2/9 = n/45 // - n/45
2/9-(n/45) = 0
2/9-1/45*n = 0 // - 2/9
-1/45*n = -2/9 // : -1/45
n = -2/9/(-1/45)
n = 10
n = 10
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