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d in (-oo:+oo)
2*d-(4*d)-1/2 = 23/18 // - 23/18
2*d-(4*d)-1/2-(23/18) = 0
2*d-4*d-1/2-23/18 = 0
-2*d-16/9 = 0 // + 16/9
-2*d = 16/9 // : -2
d = 16/9/(-2)
d = -8/9
d = -8/9
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