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d in (-oo:+oo)
1-7*d = -(2*d)-44 // + -(2*d)-44
2*d-7*d+1+44 = 0
45-5*d = 0 // - 45
-5*d = -45 // : -5
d = -45/(-5)
d = 9
d = 9
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