1.

The sum of 4x + 3y ­ 7z, x ­ y ­ z and ­2x ­ 3y + 4z is

A. 3x -­ y -­ 4z
B. 3x -­ y + 4z
C. 3x + y -­ 4z
D. 3x + y + 4z
Answer» B. 3x -­ y + 4z


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