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A18

B15

C21

D17

Answer:

A. 18

Read Explanation:

7+(4+3of4−(5+3−3))7+(4+3of4-(5+3-3))

7+(4+3of4−5)7+(4+3of4-5)

7+(4+12−5)7+(4+12-5)

7+(16−5)7+(16-5)

7+11=187+11=18

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