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d in (-oo:+oo)
-29 = 5*d-(3*d)-9 // - 5*d-(3*d)-9
3*d-(5*d)-29+9 = 0
3*d-5*d-29+9 = 0
-2*d-20 = 0 // + 20
-2*d = 20 // : -2
d = 20/(-2)
d = -10
d = -10
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