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d in (-oo:+oo)
(5/2)*d+2/5 = (9/5)*d+6/5 // - (9/5)*d+6/5
(5/2)*d-((9/5)*d)+2/5-(6/5) = 0
(5/2)*d+(-9/5)*d+2/5-6/5 = 0
7/10*d-4/5 = 0 // + 4/5
7/10*d = 4/5 // : 7/10
d = 4/5/7/10
d = 8/7
d = 8/7
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