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d in (-oo:+oo)
15-(d/12) = 37.5/75 // - 37.5/75
15-(d/12)-(37.5/75) = 0
15-(d/12)-0.5 = 0
14.5-1/12*d = 0 // - 14.5
-1/12*d = -14.5 // : -1/12
d = -14.5/(-1/12)
d = 174.00000696
d = 174.00000696
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