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d in (-oo:+oo)
4*d = 5*d-(4/2) // - 5*d-(4/2)
4*d-(5*d)+4/2 = 0
4*d-5*d+4/2 = 0
2-d = 0 // - 2
-d = -2 // * -1
d = 2
d = 2
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