Hello!
Answer:
![\boxed{x=3}](https://img.qammunity.org/2020/formulas/mathematics/high-school/nwkrp8jmy5gni3si7q96g2aw55sskyt1tv.png)
*The answer must have a POSITIVE sign!*
Explanation:
First, you subtract by 10 from both sides of an equation.
![X+10-10=13-10](https://img.qammunity.org/2020/formulas/mathematics/middle-school/qnigfz5emxps54y7oqz3tl1wiynteuwn9x.png)
Then, you subtract by the numbers from left to right.
![13-10=3](https://img.qammunity.org/2020/formulas/mathematics/middle-school/1b19rkp7110jnp0wxkd00qljkgz21z7inz.png)
Final answer is →→→→
![\boxed{X=3}](https://img.qammunity.org/2020/formulas/mathematics/middle-school/y302rzi8sn25an0xxvzq7k4qx4n5u7vbht.png)
Hope this helps!
Thanks!
-Charlie
Have a nice day! :)
:D