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n in (-oo:+oo)
49 = 1-7*n-n // - 1-7*n-n
n-(-7*n)-1+49 = 0
7*n+n-1+49 = 0
8*n+48 = 0 // - 48
8*n = -48 // : 8
n = -48/8
n = -6
n = -6
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