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d in (-oo:+oo)
-2*d-7 = 29-5*d // - 29-5*d
-2*d-(-5*d)-29-7 = 0
5*d-2*d-29-7 = 0
3*d-36 = 0 // + 36
3*d = 36 // : 3
d = 36/3
d = 12
d = 12
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