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d in (-oo:+oo)
6*d+4/7 = 68/21 // - 68/21
6*d+4/7-(68/21) = 0
6*d+4/7-68/21 = 0
6*d-8/3 = 0 // + 8/3
6*d = 8/3 // : 6
d = 8/3/6
d = 4/9
d = 4/9
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