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d in (-oo:+oo)
1/2-2*d = 31/14 // - 31/14
1/2-2*d-(31/14) = 0
1/2-2*d-31/14 = 0
-2*d-12/7 = 0 // + 12/7
-2*d = 12/7 // : -2
d = 12/7/(-2)
d = -6/7
d = -6/7
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