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d in (-oo:+oo)
(1/3)*d+2/5 = (8/5)*d+1/5 // - (8/5)*d+1/5
(1/3)*d-((8/5)*d)+2/5-(1/5) = 0
(1/3)*d+(-8/5)*d+2/5-1/5 = 0
1/5-19/15*d = 0 // - 1/5
-19/15*d = -1/5 // : -19/15
d = -1/5/(-19/15)
d = 3/19
d = 3/19
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