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d in (-oo:+oo)
6*d-(11/2) = 2*d-(13/2) // - 2*d-(13/2)
6*d-(2*d)-(11/2)+13/2 = 0
6*d-2*d-11/2+13/2 = 0
4*d+1 = 0 // - 1
4*d = -1 // : 4
d = -1/4
d = -1/4
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