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d in (-oo:+oo)
25/75 = d/12 // - d/12
25/75-(d/12) = 0
1/3-1/12*d = 0 // - 1/3
-1/12*d = -1/3 // : -1/12
d = -1/3/(-1/12)
d = 4
d = 4
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