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d in (-oo:+oo)
-7/12 = d+15/6 // - d+15/6
-d-7/12-(15/6) = 0
-d-7/12-5/2 = 0
-d-37/12 = 0 // + 37/12
-d = 37/12 // * -1
d = -37/12
d = -37/12
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