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n in (-oo:+oo)
n/5 = -1/2 // + -1/2
n/5-(-1/2) = 0
n/5+1/2 = 0
1/5*n+1/2 = 0 // - 1/2
1/5*n = -1/2 // : 1/5
n = -1/2/1/5
n = -5/2
n = -5/2
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