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d in (-oo:+oo)
-((2/3)*d)-3 = 5/3 // - 5/3
-((2/3)*d)-(5/3)-3 = 0
(-2/3)*d-5/3-3 = 0
-2/3*d-14/3 = 0 // + 14/3
-2/3*d = 14/3 // : -2/3
d = 14/3/(-2/3)
d = -7
d = -7
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