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