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n in (-oo:+oo)
7*n+n+5/9 = 35/9 // - 35/9
7*n+n+5/9-(35/9) = 0
7*n+n+5/9-35/9 = 0
8*n-10/3 = 0 // + 10/3
8*n = 10/3 // : 8
n = 10/3/8
n = 5/12
n = 5/12
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