Question

-4+5-{3+4-5-[7+(6+4)-7-6]+4

Answer 1

-4+5-{3+4-5-[7+6+4-7-6]+4
-4+5-{3+4-5-7-6-4+7+6}+4
-4+5-3-4+5+7+6+4-7-6+4=
7

Answer 2

- 4 + 5 - {3 + 4 - 5 - [7 + (6 + 4) - 7 - 6] + 4} =

- 4 + 5 – {3 + 4 – 5 – [7 + ( +10 ) – 7 – 6] + 4}

- 4 + 5 – {3 + 4 – 5 – [7 + 10 – 7 – 6] + 4}

- 4 + 5 – {3 + 4 – 5 – [ + 4 ] + 4 }

- 4 + 5 – {3 + 4 – 5 – 4 + 4}

- 4 + 5 – { + 2 }

- 4 + 5 – 2

-1