To solve 5+2(x-3), you must do the following...
You must use the distributive property to get an answer.
So, 2(x-3), correct? Okay, so first you multiply 2 times x, which would give you:
2x
Then you multiply 2 times 3, which gives you 6.
So now, you have 5+2x-6 - (Basically, we just extended the problem.)
Then we just simplify, which gives you... (drumroll please...?) 2x-1.
Hope this helps!