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n in (-oo:+oo)
9-((1/2)*n) = 4*n+5 // - 4*n+5
9-((1/2)*n)-(4*n)-5 = 0
(-1/2)*n-4*n-5+9 = 0
4-9/2*n = 0 // - 4
-9/2*n = -4 // : -9/2
n = -4/(-9/2)
n = 8/9
n = 8/9
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