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d in (-oo:+oo)
5*d = -1/2 // + -1/2
5*d-(-1/2) = 0
5*d+1/2 = 0
5*d+1/2 = 0 // - 1/2
5*d = -1/2 // : 5
d = -1/2/5
d = -1/10
d = -1/10
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