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