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d in (-oo:+oo)
4*d = -2/5 // + -2/5
4*d-(-2/5) = 0
4*d+2/5 = 0
4*d+2/5 = 0 // - 2/5
4*d = -2/5 // : 4
d = -2/5/4
d = -1/10
d = -1/10
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