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d in (-oo:+oo)
(1/3)*(d+6) = 11 // - 11
(1/3)*(d+6)-11 = 0
1/3*(d+6)-11 = 0
1/3*(d+6)-11 = 0
1/3*d-9 = 0
1/3*d-9 = 0
1/3*d-9 = 0 // + 9
1/3*d = 9 // : 1/3
d = 9/1/3
d = 27
d = 27
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