Răspuns :
5 × ( 6 + 3 - 4) + 2 - 7 - ( 13 + 6 - 5 ) =
5 × ( 9 - 4 ) + 2 - 7 - ( 19 - 5 ) =
5 × 5 + 2 - 7 - 14 =
25 + 2 - 7 - 14 =
27 - 7 - 14 =
20 - 14 = 6
5 × ( 6 + 3 - 4) + 2 - 7 - ( 13 + 6 - 5 ) =
5 × ( 9 - 4 ) + 2 - 7 - ( 19 - 5 ) =
5 × 5 + 2 - 7 - 14 =
25 + 2 - 7 - 14 =
27 - 7 - 14 =
20 - 14 = 6