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d in (-oo:+oo)
d+d-(3/7) = 26/21 // - 26/21
d+d-(3/7)-(26/21) = 0
d+d-3/7-26/21 = 0
2*d-5/3 = 0 // + 5/3
2*d = 5/3 // : 2
d = 5/3/2
d = 5/6
d = 5/6
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