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d in (-oo:+oo)
23/5 = (-2/3)*d-(5*d)+8 // - (-2/3)*d-(5*d)+8
5*d-((-2/3)*d)+23/5-8 = 0
(2/3)*d+5*d+23/5-8 = 0
17/3*d-17/5 = 0 // + 17/5
17/3*d = 17/5 // : 17/3
d = 17/5/17/3
d = 3/5
d = 3/5
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