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d in (-oo:+oo)
-29 = d/2-13 // - d/2-13
13-(d/2)-29 = 0
-1/2*d-16 = 0 // + 16
-1/2*d = 16 // : -1/2
d = 16/(-1/2)
d = -32
d = -32
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