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d in (-oo:+oo)
(1/3)*(3*d+9) = 12 // - 12
(1/3)*(3*d+9)-12 = 0
1/3*(3*d+9)-12 = 0
1/3*(3*d+9)-12 = 0
d-9 = 0
d-9 = 0
d-9 = 0 // + 9
d = 9
d = 9
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