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n in (-oo:+oo)
7*(n-9) = -56 // + 56
7*(n-9)+56 = 0
7*(n-9)+56 = 0
7*n-7 = 0
7*n-7 = 0
7*n-7 = 0 // + 7
7*n = 7 // : 7
n = 7/7
n = 1
n = 1
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