For the equation, we only know that x+3= 12 or x+3 = -12.
(X+3=12) First possible solution.
X +3 = 12
Add -3 to each side which will get rid of 3 and leave X= 12-3
Which leads to X= 9.
(X+3= -12) Second possible solution.
X+3= -12
Add -3 to both sides which will get rid of 3 and leave x= -12 -3
Which leads to x= -15
Answer: x= 9 or x= -15
