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d in (-oo:+oo)
0.5/2 = d/13 // - d/13
0.5/2-(d/13) = 0
0.25-1/13*d = 0 // - 0.25
-1/13*d = -0.25 // : -1/13
d = -0.25/(-1/13)
d = 3.24999987
d = 3.24999987
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