Explain how to simplify this expression 4a + 19 - 3a - 7

The answer is a + 12

Solution:
In order to solve it, you need to separately solve the numbers that have something in common- for ex: if they are just numbers, or if they have the same exact variables

In order to make it easier, you can rearrange the equation
4a - 3a + 19 - 7
4a - 3a = a
19 - 7 = 12

Since these numbers can't be combined due to the fact that they have nothing in common, you leave the equation as is, resulting in the

a + 12

Hello!

To solve this we will combine like terms (variables, constants) for our final solution.

4a+19-3a-7
4a-3a+19-7
a+12

Our simplified expression is a+12.

I hope this helps!