Question

Add the following: (x+y+z,x-y-z,x+y-z )

the answer is 7xyz but I need the solution pls​
I have an exam tomorrow

Answer 1

Step-by-step explanation:

(x+y+z+x-y-z+x+y-z)

(3x+y+z)

Answer 2

Answer:

$= > x + y + z + x - y - z + x + y - z$

$= > x + x + x + y - y + y + z - z - z$

$= > 3x + y - z$