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d in (-oo:+oo)
2*d+4/9 = 5*d-(185/9) // - 5*d-(185/9)
2*d-(5*d)+4/9+185/9 = 0
2*d-5*d+4/9+185/9 = 0
21-3*d = 0 // - 21
-3*d = -21 // : -3
d = -21/(-3)
d = 7
d = 7
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