Evaluate
-27
Factor
-27
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20-\left(28+4-\left(-15\right)\right)
The opposite of -20 is 20.
20-\left(32-\left(-15\right)\right)
Add 28 and 4 to get 32.
20-\left(32+15\right)
The opposite of -15 is 15.
20-47
Add 32 and 15 to get 47.
-27
Subtract 47 from 20 to get -27.
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