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d in (-oo:+oo)
(-1/3)*d+7 = 184/27 // - 184/27
(-1/3)*d-(184/27)+7 = 0
(-1/3)*d-184/27+7 = 0
5/27-1/3*d = 0 // - 5/27
-1/3*d = -5/27 // : -1/3
d = -5/27/(-1/3)
d = 5/9
d = 5/9
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