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d in (-oo:+oo)
2*(d-(1/4))+(1/2)*d = 11/2 // - 11/2
2*(d-(1/4))+(1/2)*d-(11/2) = 0
2*(d-1/4)+(1/2)*d-11/2 = 0
2*(d-1/4)+d/2-11/2 = 0
(2^2*(d-1/4))/2+d/2-11/2 = 0
2^2*(d-1/4)+d-11 = 0
5*d-11-1 = 0
5*d-12 = 0
(5*d-12)/2 = 0
(5*d-12)/2 = 0 // * 2
5*d-12 = 0
5*d-12 = 0 // + 12
5*d = 12 // : 5
d = 12/5
d = 12/5
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