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