Combine like terms in the expression

3x+2+9x-7

12x-5

Step-by-step explanation:

3x and 9x are like terms, and so are 2 - 7. You can identify like terms as they most likely end the same. When you have your like terms identified, just add them like normal.

3x + 9x = 12x

2 - 7 = - 5

12x-5

Step-by-step explanation:

3x+2+9x-7 = 12x-5

First, collect like terms which is 12x+2-7. Then, calculate the difference which is 12x-5.