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n in (-oo:+oo)
2*n+4 = 38/9 // - 38/9
2*n-(38/9)+4 = 0
2*n-38/9+4 = 0
2*n-2/9 = 0 // + 2/9
2*n = 2/9 // : 2
n = 2/9/2
n = 1/9
n = 1/9
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