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d in (-oo:+oo)
1-(7*d)-(4*d) = 45 // - 45
1-(7*d)-(4*d)-45 = 0
1-7*d-4*d-45 = 0
-11*d-44 = 0 // + 44
-11*d = 44 // : -11
d = 44/(-11)
d = -4
d = -4
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