How to calculate 9.8 plus 0.2 minus 9.8 plus 0.2?

How to calculate 9.8 plus 0.2 minus 9.8 plus 0.2?

9.8+0.2-9.8+0.2=9.8-9.8+0.2+0.2=0+0.2+0.2=0.4