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d in (-oo:+oo)
d/5+13/15 = d/3+103/120 // - d/3+103/120
d/5-(d/3)+13/15-(103/120) = 0
d/5-(d/3)+13/15-103/120 = 0
1/120-2/15*d = 0 // - 1/120
-2/15*d = -1/120 // : -2/15
d = -1/120/(-2/15)
d = 1/16
d = 1/16
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