Bonjour,

A = 3/5 - 1/5 x 7/3

A = 3/5 - 7/15

A = 9/15 - 7/15

A = 2/15

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B = ( 2/9 + 1/6 )/( 2 - 7/3 )

B = ( 12/54 + 9/54 )/( 6/3 - 7/3 )

B = ( 21/54 )/( -1/3 )

B = ( 21/54 )/( -18/54 )

B = -7/6