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n in (-oo:+oo)
2/3 = -8*n // + -8*n
2/3-(-8*n) = 0
8*n+2/3 = 0
8*n+2/3 = 0 // - 2/3
8*n = -2/3 // : 8
n = -2/3/8
n = -1/12
n = -1/12
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