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d in (-oo:+oo)
5*d-(2/3) = (1/3)*d // - (1/3)*d
5*d-((1/3)*d)-(2/3) = 0
5*d+(-1/3)*d-2/3 = 0
14/3*d-2/3 = 0 // + 2/3
14/3*d = 2/3 // : 14/3
d = 2/3/14/3
d = 1/7
d = 1/7
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