- ( - 21,4 + 12,7 ) + ( - 20,4 + 12,7 )
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1
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1
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-\left(-8,7\right)-20,4+12,7
Add -21,4 and 12,7 to get -8,7.
8,7-20,4+12,7
The opposite of -8,7 is 8,7.
-11,7+12,7
Subtract 20,4 from 8,7 to get -11,7.
1
Add -11,7 and 12,7 to get 1.
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