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d in (-oo:+oo)
(2*d)/6+9/6 = 11 // - 11
(2*d)/6+9/6-11 = 0
1/3*d-19/2 = 0 // + 19/2
1/3*d = 19/2 // : 1/3
d = 19/2/1/3
d = 57/2
d = 57/2
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