Help??!! Please I’m not really understanding

Answer:4.23
Step-by-step explanation:
First you plug in the 0.3 to the x’s to get 0.3*divided by 0.9+1.2+(7-4). You then follow the rules of pemdas to get 0.027 divided by 0.9+1.2+7-4. You then divide 0.27 by 0.9 to get 0.03. After that you add 0.03+1.2+7 to get 8.23. Then you subtract 8.23 by 4 to get 4.23.