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d in (-oo:+oo)
16 = (d/(-12))/14 // - (d/(-12))/14
16-((d/(-12))/14) = 0
(1/168)*d+16 = 0
1/168*d+16 = 0 // - 16
1/168*d = -16 // : 1/168
d = -16/1/168
d = -2688
d = -2688
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