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d in (-oo:+oo)
(1/3)*d+4/7 = 76/231 // - 76/231
(1/3)*d+4/7-(76/231) = 0
(1/3)*d+4/7-76/231 = 0
1/3*d+8/33 = 0 // - 8/33
1/3*d = -8/33 // : 1/3
d = -8/33/1/3
d = -8/11
d = -8/11
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