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"and" indicates the operation addition (+)

(3xyz + 4yz + 5zx) + (7xz - 6yz + 4xyz) + (-9xyz - 11zy + 9xz)

Find like terms on the parenthesis, then add. In this case there are no like terms in the parentheses.

Add like terms.

The like terms are:

= 3xyz + 4xyz - 9xyz,

= 4yz - 6yz -11zy, and

= 5zx + 7xz + 9xz

Add the like terms:

= (3 + 4 - 9)xyz

= (7 - 9)xyz

= -2xyz

= (4 - 6 - 11)yz

= (-2 - 11)yz

= -13yz

= (5 + 7 + 9)xz

= (12 + 9) xz

= 21xz

(In some cases, you can switch the terms by each other, but the answer is considered no matter what the arrangement of the terms should be)

(3xyz + 4yz + 5zx) + (7xz - 6yz + 4xyz) + (-9xyz - 11zy + 9xz)

Find like terms on the parenthesis, then add. In this case there are no like terms in the parentheses.

Add like terms.

The like terms are:

= 3xyz + 4xyz - 9xyz,

= 4yz - 6yz -11zy, and

= 5zx + 7xz + 9xz

Add the like terms:

= (3 + 4 - 9)xyz

= (7 - 9)xyz

= -2xyz

= (4 - 6 - 11)yz

= (-2 - 11)yz

= -13yz

= (5 + 7 + 9)xz

= (12 + 9) xz

= 21xz

__The final answer is:__

__-2xyz - 13yz + 21xz__(In some cases, you can switch the terms by each other, but the answer is considered no matter what the arrangement of the terms should be)