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d in (-oo:+oo)
4*d-(5*d)-7 = -1 // + 1
4*d-(5*d)-7+1 = 0
4*d-5*d-7+1 = 0
-d-6 = 0 // + 6
-d = 6 // * -1
d = -6
d = -6
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