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d in (-oo:+oo)
9-(3*d) = 42 // - 42
9-(3*d)-42 = 0
9-3*d-42 = 0
-3*d-33 = 0 // + 33
-3*d = 33 // : -3
d = 33/(-3)
d = -11
d = -11
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