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n in (-oo:+oo)
2*n+3*n = 2/9 // - 2/9
2*n+3*n-(2/9) = 0
2*n+3*n-2/9 = 0
5*n-2/9 = 0 // + 2/9
5*n = 2/9 // : 5
n = 2/9/5
n = 2/45
n = 2/45
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