5x - 6y + 10y - 2x combine like terms

3x+4

Step one: subtract 5x and 2x
Step two: add -6y and 10y

Hope this helped!

If you want it the long way, you can go like this:
1. (5x)(-6y)(10y)(-2x)
The subtracted numbers becomes negative.

2. Just put the numbers with the same variables together.
(5x-2x)(-6y+10y)
Numbers that are positive becomes addition

4. Do the parenthesis. (Only numbers with the same variables should be added/subtracted together.)
5x-2x becomes 3x and -6y+10y becomes 4y.

The answer is 3x+4y.

I explained in a confusing way, but basically, just put together the numbers with the same variables (letters).

5m( 3n + 7y ) - 2k( 3n + 7y ) = ( 3n + 7y )( 5m - 2k ).