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