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d in (-oo:+oo)
1/2-(6*d) = 5 // - 5
1/2-(6*d)-5 = 0
1/2-6*d-5 = 0
-6*d-9/2 = 0 // + 9/2
-6*d = 9/2 // : -6
d = 9/2/(-6)
d = -3/4
d = -3/4
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