Final answer:
The expression '5x-2+ 12x 3' assuming a typo and is actually '5x - 2 + 12x + 3', simplifies to '17x + 1' after combining like terms.
Step-by-step explanation:
If we're looking at the expression '5x-2+ 12x 3' and assuming it is meant to be '5x - 2 + 12x + 3', then we need to combine like terms to simplify the expression.
First, we combine the '5x' and '12x' as they are like terms that represent quantities of x.
5x + 12x = 17x
Next, we combine the constants -2 and +3.
-2 + 3 = 1
So, the simplified expression is:
17x + 1
This is a basic algebraic operation of combining like terms.