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d in (-oo:+oo)
(-4/10)*d = -25 // + 25
(-4/10)*d+25 = 0
25-2/5*d = 0 // - 25
-2/5*d = -25 // : -2/5
d = -25/(-2/5)
d = 125/2
d = 125/2
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