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The same way you'd add any other negative numbers.

Adding a negative is the same as subtracting, and subtracting a negative is the same as adding.

(-2) + (-2) = (-4)

(-2) - (-2) = 0

you are wrong if you add or subtract two negitives its always a positive dont you know your math.

And the second problem you have is wrong to because when you subtract two negitives you change the sign of the secong number to positive and you change the subtraction sign to a addition sign.

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Q: How do you add and subtract negative decimals?
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