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A = 2 - 2 + 12 - 6  = 14 - 8 = 6

B  = 10 - ( 5 - 6) + 2 - 3

B = 10 - ( - 1 ) - 1

B = 10 + 1 - 1 = 10

C = 23 - 3.5 + 7.7 - 6.5 + 25 - 1 - 25

C  = 55.7 - 36

C = 19.7

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