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n in (-oo:+oo)
n-4 = 17-6*n // - 17-6*n
n-(-6*n)-17-4 = 0
n+6*n-17-4 = 0
7*n-21 = 0 // + 21
7*n = 21 // : 7
n = 21/7
n = 3
n = 3
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