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d in (-oo:+oo)
(5/3)*d = 15/9 // - 15/9
(5/3)*d-(15/9) = 0
(5/3)*d-5/3 = 0
5/3*d-5/3 = 0 // + 5/3
5/3*d = 5/3 // : 5/3
d = 5/3/5/3
d = 1
d = 1
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