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n in (-oo:+oo)
2*n-(2/3) = (7/9)*n // - (7/9)*n
2*n-((7/9)*n)-(2/3) = 0
2*n+(-7/9)*n-2/3 = 0
11/9*n-2/3 = 0 // + 2/3
11/9*n = 2/3 // : 11/9
n = 2/3/11/9
n = 6/11
n = 6/11
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