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n in (-oo:+oo)
5*n-2*n-(5/9) = 17/18 // - 17/18
5*n-2*n-(5/9)-(17/18) = 0
5*n-2*n-5/9-17/18 = 0
3*n-3/2 = 0 // + 3/2
3*n = 3/2 // : 3
n = 3/2/3
n = 1/2
n = 1/2
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