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