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d in (-oo:+oo)
4-(6*d) = 58 // - 58
4-(6*d)-58 = 0
4-6*d-58 = 0
-6*d-54 = 0 // + 54
-6*d = 54 // : -6
d = 54/(-6)
d = -9
d = -9
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