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d in (-oo:+oo)
2-d = 1.2/1.5 // - 1.2/1.5
2-d-(1.2/1.5) = 0
2-d-0.8 = 0
1.2-d = 0 // - 1.2
-d = -1.2 // * -1
d = 1.2
d = 1.2
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