Step 1: Calculate the value inside the first parentheses
21040 - 9450 = 11590

Step 2: Multiply the result by 8
8 * 11590 = 92720

Step 3: Divide that result by 2
92720 / 2 = 46360

Step 4: Subtract 435 from 1350
1350 - 435 = 915

Step 5: Multiply X by 3 and subtract 915 from it to equal 0
3X - 915 = 0
3X = 915
X = 915 / 3
X = 305

Step 6: Add 1020 to 1520 and divide by 4
1520 + 1020 = 2540
2540 / 4 = 635

Therefore, the final answer is:
46360 = 305 + 635