Subtract x - 2y from the sum of -3x + 5y - 3z and 2x - 7y + 3z.
First, find the sum (addition) of -3x + 5y - 3z and 2x - 7y + 3z. To do this, Combine like terms (values with the same variable).
-3x + 2x = -x
5y + -7y = -2y
-3z + 3z = 0
-3x + 5y - 3z + 2x - 7y + 3z = -x -2y
Now subtract x -2y from -x -2y
-x -x = -2x
-2y + 2y = 0
Your final answer is -2x