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From 12x ­- 6y + 9z subtract -x­ -3z + 6y . A)   12z ­- 13x -­ 12y B)   13x + 12y + 12z C)  - ­13x -­ 12y ­- 12z D)   13x -­ 12y + 12z
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From 12x ­- 6y + 9z subtract -x­ -3z + 6y . A)   12z ­- 13x -­ 12y B)   13x + 12y + 12z C)  - ­13x -­ 12y ­- 12z D)   13x -­ 12y + 12z

User Ircmaxell
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12x - 6y + 9z - (-x - 3z + 6y) = 12x - 6y + 9z + x + 3z - 6y = 13x - 12y + 12z
User Pastullo
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