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n in (-oo:+oo)
n/(-2) = 4/9 // - 4/9
n/(-2)-(4/9) = 0
n/(-2)-4/9 = 0
-1/2*n-4/9 = 0 // + 4/9
-1/2*n = 4/9 // : -1/2
n = 4/9/(-1/2)
n = -8/9
n = -8/9
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