Question

What's (-12x+ 8)+(3x+19)??

Answer 1

since you have a + sign in front of the parentheses, you can drop the parentheses

-12x + 8 + 3x + 19

combine like terms

Answer 2

(-12x+ 8)+(3x+19)
remove the parenthesis
-12x + 8 + 3x + 19
then simply add the like terms
( like terms are terms that have the same variable. an example would be 4a and 2a cause they both have a variable of a )
the like terms in -12x + 8 + 3x + 19 are -12x with 3x and 8 with 9
so simply add them and you will get the answer
-12x + 3x =
8 + 9 =