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prealgebra intermediate

Problem

[x - (y - z)] - [(x - y) - z] =

(A)

2 y

(B)

2 z

(C)

- 2 y

(D)

- 2 z

Solution

The expression becomes

(x - y + z) - (x - y - z) = x - y + z - x + y + z = 2 z

, which is

2 z

.

Final answer

B