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A = 1/2 + 3/4 x 2/5

  = 1/2 + 6/20

  =  10/20 + 6 /20

  = 16/20 = 4 /5

B = ( 7/6 - 1 /2 ) x 9 / 7

  = ( 7/6 - 3/6 ) x 9 /7

 =  4/6 x 9/7

=  36/42

 =  6 / 7

C = 10 - 3/4 x 7 + 38/2

  10 - 21 /4 + 19

  40/4 - 21 /4 + 76/4

  =  95/4  

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