`A= 2 1/547 . 3 /211 - 546/547 . 1/ 211 - 4/(547.211)`
`A = 2 1/547 . 3 . 1/211 - 546/547 . 1/211 - 4/547 . 1/211`
`A= 1/211 . ( 2 1/547 . 3 - 546/547 - 4/547)`
`A= 1/211 . ( 6 + 3/547 - 546/547 + 4/547)`
`A=1/211 . ( 6 + 3/547 - 550/547)`
`A = 1/211 .( 6 + -547/547)`
`A = 1/211 . ( 6 - 1)`
`A = 1/211 . 5 = 5/211`
\(A=\dfrac{1}{211.547}\left(2\cdot3-546-4\right)=\dfrac{-544}{211\cdot547}\)