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d in (-oo:+oo)
(1/2)*d-3*d-(7/9) = 11/18 // - 11/18
(1/2)*d-3*d-(7/9)-(11/18) = 0
(1/2)*d-3*d-7/9-11/18 = 0
-5/2*d-25/18 = 0 // + 25/18
-5/2*d = 25/18 // : -5/2
d = 25/18/(-5/2)
d = -5/9
d = -5/9
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