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It can be easily understood that both are equal.
Because if you multiply a negative number with another negative number, you get a positive number.
Here,
-(-9) = -1Ã-9 = 9
Hence, proved.
Note:
Negativeà Negative= Positive
Positiveà Positive= Positive
Positiveà Negative= Negative
Negativeà Positive= Negative
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