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
