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d in (-oo:+oo)
(3*(2*d-6))/2 = 2 // - 2
(3*(2*d-6))/2-2 = 0
(3*(2*d-6))/2+(-2*2)/2 = 0
3*(2*d-6)-2*2 = 0
6*d-22 = 0
(6*d-22)/2 = 0
(6*d-22)/2 = 0 // * 2
6*d-22 = 0
6*d-22 = 0 // + 22
6*d = 22 // : 6
d = 22/6
d = 11/3
d = 11/3
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