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