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d in (-oo:+oo)
-12 = 5*d+2*d-5 // - 5*d+2*d-5
5-(5*d)-(2*d)-12 = 0
5-5*d-2*d-12 = 0
-7*d-7 = 0 // + 7
-7*d = 7 // : -7
d = 7/(-7)
d = -1
d = -1
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