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n in (-oo:+oo)
1-((2/3)*n) = 7/18 // - 7/18
1-((2/3)*n)-(7/18) = 0
(-2/3)*n-7/18+1 = 0
11/18-2/3*n = 0 // - 11/18
-2/3*n = -11/18 // : -2/3
n = -11/18/(-2/3)
n = 11/12
n = 11/12
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