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d in (-oo:+oo)
4/12 = d-2.5 // - d-2.5
4/12-d+2.5 = 0
2.83333333-d = 0 // - 2.83333333
-d = -2.83333333 // * -1
d = 2.83333333
d = 2.83333333
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