Question

18-{4-[-8+(-9+7)-8+3]-9}

Answer 1

18 - {4- [-8 + (-9+7) -8 + 3] - 9} = 
18 - {4- [-8 + (-2) -8 +3] -9}=
18 - {4- [-10 -8 + 3] -9}=
18 - {4- [-18 +3] -9 }=
18 - {4- (-15) - 9} =
18 - { 19 - 9} =
18- 10 =
8