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d in (-oo:+oo)
32/7 = 2*d+4*d+4/7 // - 2*d+4*d+4/7
32/7-(2*d)-(4*d)-(4/7) = 0
32/7-2*d-4*d-4/7 = 0
4-6*d = 0 // - 4
-6*d = -4 // : -6
d = -4/(-6)
d = 2/3
d = 2/3
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