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n in (-oo:+oo)
n/8+1/2 = -31/2 // + -31/2
n/8+1/2-(-31/2) = 0
n/8+1/2+31/2 = 0
1/8*n+16 = 0 // - 16
1/8*n = -16 // : 1/8
n = -16/1/8
n = -128
n = -128
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