( 15 + ____ ) + 18 = 15 + ( 6 + 18 ) 

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Sagot :

Answer:

(15 + (-18)) + 18 = 15 + (6 + 18)

Answer:

6

Step-by-step explanation:

( 15 + 6 ) + 18 = 15 + ( 6 + 18 ) 

21 + 18 = 15 + 24

39 = 39

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