Question

e. 30 – {105 - [ - 80 + (60 -10 – 80) – 30 ] +107}

Answer 1

30−(105−(−80+60−10−80−30)+107)\\

=30−(105−(−80+50−80−30)+107)

=30−(105−(−80+−30−30)+107)

=30−(105−(−110−30)+107)

=30−(105−(−140)+107)

=30−(245+107)

=30−352

=−322