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