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d in (-oo:+oo)
(1/4)*(8*d-40) = 1 // - 1
(1/4)*(8*d-40)-1 = 0
1/4*(8*d-40)-1 = 0
1/4*(8*d-40)-1 = 0
2*d-11 = 0
2*d-11 = 0
2*d-11 = 0 // + 11
2*d = 11 // : 2
d = 11/2
d = 11/2
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