First, let's simplify the fractions:
-3/8 + 1/21 + 1/3 - 2/5
To add fractions, we need a common denominator. The least common denominator for 8, 21, 3, and 5 is 840.
Multiplying each fraction by the appropriate factor to achieve the common denominator, we get:
-315/840 + 40/840 + 280/840 - 336/840
Now, we can add them together:
(-315 + 40 + 280 - 336) / 840(-331) / 840
Therefore, the final answer is -331/840, which is approximately equal to -0.393.
First, let's simplify the fractions:
-3/8 + 1/21 + 1/3 - 2/5
To add fractions, we need a common denominator. The least common denominator for 8, 21, 3, and 5 is 840.
Multiplying each fraction by the appropriate factor to achieve the common denominator, we get:
-315/840 + 40/840 + 280/840 - 336/840
Now, we can add them together:
(-315 + 40 + 280 - 336) / 840
(-331) / 840
Therefore, the final answer is -331/840, which is approximately equal to -0.393.