Question

7 - {5+ [ 8 - ( 12 - 9 ) ] - 3 }

Answer 1

7 - {5+ [ 8 - ( 12 - 9 ) ] - 3 } =
7-{5+[8-3]-3}=
7-{5+5-3} =
7-{10-3} =
7-7 =
0

Um abraço.

Answer 2

7 - {5+ [ 8 - ( 12 - 9 ) ] - 3 }=
7-{5+[8-3]-3}=
7-{5+5-3}=
7-7=
0