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-Combine all the like terms...

-If the equation is 4xy+17xy-12x, then you add 4xy and 17xy because they are like terms.

-So, you get 21xy-12x. You don't do anything else because there are no more like terms.

For subtraction:

-If the equation is 3xy+6z-(7xy-12x), then you must first change the signs of the numbers within the parenthesis.

-So, the equation becomes 3xy+6z-7xy+12x.

-Combine all the like terms, and you get -4xy+6z-12x.

(2xy + 3y - 2) + (5xy - 2y + 3)

2xy + 3y - 2

+ 5xy - 2y + 3

= 7xy + 1y + 1

1y can be just "y" ...

For example...

(2ab + 3b - 2c) - (5ab - 3b + 2c) Subtract as usual so the signs of the other polynomial will change..

2ab + 3b - 2c

- -5ab + 3b - 2c

= -3ab + 6b - 4c