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d in (-oo:+oo)
(-1/3)*d-((5/7)*d)+8 = 482/63 // - 482/63
(-1/3)*d-((5/7)*d)-(482/63)+8 = 0
(-1/3)*d+(-5/7)*d-482/63+8 = 0
22/63-22/21*d = 0 // - 22/63
-22/21*d = -22/63 // : -22/21
d = -22/63/(-22/21)
d = 1/3
d = 1/3
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