Question

\(7-\left\{12-\left[-\left(-3\right)+\left(-10\right)-\left(-11\right)\right]-\left[-\left(-9\right)+\left(-8\right)-\left(+12\right)\right]\right\}-\left(-4\right)\)

Answer 1

\(7-\left\{12-\left[-\left(-3\right)+\left(-10\right)-\left(-11\right)\right]-\left[-\left(-9\right)+\left(-8\right)-12\right]\right\}\)\(-\left(-4\right)\)

= \(7-\left\{12-\left[3+\left(-10\right)+11\right]-\left[9+\left(-8\right)-12\right]\right\}\) \(+4\)

= \(7-\left\{12-\left[7+11\right]-\left[1-12\right]\right\}+4\)

= \(7-\left\{12-18-\left(-11\right)\right\}+4\)

= \(7-\left\{-6+11\right\}+4\)

= \(7-5+4\)

= 6

Answer 2

7 - { 12 - [ - (- 3) + (- 10) - (- 11) ] - [ - (- 9) + (- 8) - (+ 12) ] } - (- 4)

= 7 - [ 12 - ( 3 - 10 + 11 ) - ( 9 - 8 - 12 ) ] + 4

= 7 - ( 12 - 4 + 11 ) + 4

=7 - 19 + 4

= - 8