Answer:
1/2
Explanation:
You need to use PEMDAS to know that you should do subtraction and addition first. Since they are are (-) you can just go from left to right. Solve the first part by making it 10/10 and then subtract 4/10 from that (2/5 simplified) and then take another 1/10 off of it and you have 5/10. Simplify to get the answer of 1/2