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d in (-oo:+oo)
4*d+4 = 5*d-5 // - 5*d-5
4*d-(5*d)+4+5 = 0
4*d-5*d+4+5 = 0
9-d = 0 // - 9
-d = -9 // * -1
d = 9
d = 9
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