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d in (-oo:+oo)
(1/4)*d-1 = -33/28 // + -33/28
(1/4)*d-(-33/28)-1 = 0
(1/4)*d+33/28-1 = 0
1/4*d+5/28 = 0 // - 5/28
1/4*d = -5/28 // : 1/4
d = -5/28/1/4
d = -5/7
d = -5/7
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