# How do you find the sum or difference of (4x+2y-6z)+(5y-2z+7z)+(-9z-2x-3y)?

Mar 6, 2017

See the entire solution process below:

#### Explanation:

First, remove all of the terms from parenthesis. Be careful to handle the signs of the individual terms correctly:

$4 x + 2 y - 6 z + 5 y - 2 z + 7 z - 9 z - 2 x - 3 y$

Next, group like terms together:

$4 x - 2 x + 2 y + 5 y - 3 y - 6 z - 2 z + 7 z - 9 z$

Now, combine like terms:

$\left(4 - 2\right) x + \left(2 + 5 - 3\right) y + \left(- 6 - 2 + 7 - 9\right) z$

$2 x + 4 y - 10 z$