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n in (-oo:+oo)
7*n+9 = 32/9 // - 32/9
7*n-(32/9)+9 = 0
7*n-32/9+9 = 0
7*n+49/9 = 0 // - 49/9
7*n = -49/9 // : 7
n = -49/9/7
n = -7/9
n = -7/9
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