Answer: 9 + -4 + -7 + 2 = 0
Explanation:
To begin with, I started with a simple number 9. No decimals and only single digits although I could have started with any number.
From there, I used a negative number. I chose -4 at random but again kept it simple. Now the sum is 5.
After, I used another negative number -7 at random again. Now the sum is -2.
Finally, on the most important number I used 2 because 2+(-2)=0. Now the sum is 5.
9, -4, -7 and 2 none of which are opposites of each other. I could use them in any order, and we we still get the sum as 0.
Tbh, the first 3 numbers you choose don't really matter, but the 4th one really matters. I could choose very long numbers with intricate decimals, and it doesn't matter.
But what matters is the fourth number is the opposite of the sum of the first three numbers. Like how 2 is the opposite of -2 and -2 was the sum of the first 3 numbers.
Also, one other thing that matters is at least one of the four numbers has to be positive and 1 of the 4 numbers has to be negative. But the most important thing is the fourth number is the opposite of the sum of the first three numbers.
Hope that helped a lot.
:)