Trying to help my daughter with problems like this

From this type of question, I think transformation is that how you move same unit together(or one side) and solve "g" . Thus this question -8+g-12=-16 (1) move same unit to one side; g=-16+12+8. Remember that as you move the number from left to right,
you have to change the symbol of each number. So, -12 moves to right becomes +12; -8 moves to right becomes +8 (2) the answer g=4