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2 - 2¹/₃ = - 1/3
3¹/₄ = 13/4
Entonces
6/4 x 13/4 x 3/7 ( - 1/3 ) =
( 6 )( 13 )( 3 )( - 1 ) / ( 4 ) ( 4 ) ( 7 )( 3 ) =
- 234 / 336 = - 78 / 12 = - 39 /56
R = - 39/56