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d in (-oo:+oo)
d/20 = -1/5 // + -1/5
d/20-(-1/5) = 0
d/20+1/5 = 0
1/20*d+1/5 = 0 // - 1/5
1/20*d = -1/5 // : 1/20
d = -1/5/1/20
d = -4
d = -4
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