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d in (-oo:+oo)
(1/2)*d-((5/6)*d)-6 = -2 // + 2
(1/2)*d-((5/6)*d)-6+2 = 0
(1/2)*d+(-5/6)*d-6+2 = 0
-1/3*d-4 = 0 // + 4
-1/3*d = 4 // : -1/3
d = 4/(-1/3)
d = -12
d = -12
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