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n in (-oo:+oo)
7*n+6 = 89/9 // - 89/9
7*n-(89/9)+6 = 0
7*n-89/9+6 = 0
7*n-35/9 = 0 // + 35/9
7*n = 35/9 // : 7
n = 35/9/7
n = 5/9
n = 5/9
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