Combine like terms.
Since 7x and 6x both have a variable of x, you can combine them.
[tex] 7x + 6x = 13x [/tex]
After that, you are left with:
[tex] 13x + 11 + 3 [/tex]
You also have two numbers without variables; 11 and 3. You can also combine those.
[tex] 11 + 3 = 14 [/tex]
So, your final answer would be:
[tex] 13x + 14 [/tex]