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d in (-oo:+oo)
1/2-(10*d) = 3 // - 3
1/2-(10*d)-3 = 0
1/2-10*d-3 = 0
-10*d-5/2 = 0 // + 5/2
-10*d = 5/2 // : -10
d = 5/2/(-10)
d = -1/4
d = -1/4
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