# How do you simplify  3 x + 1 x + 2 − − 5 x + 7 ?

May 4, 2018

$= 9 x + 9$

#### Explanation:

We can add everything together. The variables for themselves and the integers for themselves.

$3 x + 1 x + 2 - \left(- 5 x\right) + 7$

$4 x + 2 - \left(- 5 x\right) + 7$

For $- \left(- 5 x\right)$ you know that $\left(-\right) \cdot \left(-\right) = +$. So, since it's written as $- \left(- 5 x\right)$ it will be equal to $5 x$.

$4 x + 2 + 7 - \left(- 5 x\right)$

$4 x + 9 + 5 x$

We will then land on the answer,

$= 9 x + 9$