What reason is incorrect?

4x + 5x + 12 = - 6 (given)

9x + 12 = - 6 (simplify)

9x = - 18 (subtraction)

x = - 2 (addition)

-

A) addition

B) given

C) simplify

D) subtraction

A) addition

Step-by-step explanation:

4x + 5x + 12 = - 6 (given) this is the given info

9x + 12 = - 6 (simplify) to simplify, combine like terms, 4x + 5x = 9x

9x = - 18 (subtraction) you are subtracting 12 from both sides to cancel out 12

x = - 2 (addition) you are not adding, you are dividing by 9 to get x alone

you are not adding