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d in (-oo:+oo)
(1/2)*d+3/8 = -2*d // + -2*d
(1/2)*d-(-2*d)+3/8 = 0
(1/2)*d+2*d+3/8 = 0
5/2*d+3/8 = 0 // - 3/8
5/2*d = -3/8 // : 5/2
d = -3/8/5/2
d = -3/20
d = -3/20
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