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n in (-oo:+oo)
4/3 = n/9 // - n/9
4/3-(n/9) = 0
4/3-1/9*n = 0 // - 4/3
-1/9*n = -4/3 // : -1/9
n = -4/3/(-1/9)
n = 12
n = 12
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