Question

Please tell me answer fast ..​

Answer 1

$\tt \large \mapsto \: \: ( - 30) + \{( - 9) - ( - 27) \} \\ \\ \tt \large \mapsto \: \: - 30 + \{ - 9 + 27 \} \\ \\ \tt \large\mapsto \: \: - 30 + (18) \\ \\ \tt \large\mapsto \: \: - 30 + 18 \: \: = \sf \: \: \red{ - 12}$