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n in (-oo:+oo)
(2/9)*n-5 = (5/9)*n+2 // - (5/9)*n+2
(2/9)*n-((5/9)*n)-5-2 = 0
(2/9)*n+(-5/9)*n-5-2 = 0
-1/3*n-7 = 0 // + 7
-1/3*n = 7 // : -1/3
n = 7/(-1/3)
n = -21
n = -21
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