Arithmetic 8.4-2

8.4 - 2 = 6.4

5x + 15x =

6.4

To find the value of the arithmetic expression 8.4 - 2, you simply subtract 2 from 8.4.

So, 8.4 - 2 = 6.4.

This can be done by subtracting 2 from the whole number part (8) and subtracting 2 from the decimal part (0.4).

8 - 2 = 6 (whole numbers)
0.4 - 0 = 0.4 (decimals)

Therefore, the result is 6.4.