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d in (-oo:+oo)
2*d+9 = 7*d+44 // - 7*d+44
2*d-(7*d)-44+9 = 0
2*d-7*d-44+9 = 0
-5*d-35 = 0 // + 35
-5*d = 35 // : -5
d = 35/(-5)
d = -7
d = -7
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