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