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d in (-oo:+oo)
0.5 = d/10 // - d/10
0.5-(d/10) = 0
0.5-1/10*d = 0 // - 0.5
-1/10*d = -0.5 // : -1/10
d = -0.5/(-1/10)
d = 5
d = 5
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