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n in (-oo:+oo)
2/3-((5/6)*n) = 9 // - 9
2/3-((5/6)*n)-9 = 0
(-5/6)*n+2/3-9 = 0
-5/6*n-25/3 = 0 // + 25/3
-5/6*n = 25/3 // : -5/6
n = 25/3/(-5/6)
n = -10
n = -10
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