Answer:
93
Step-by-step explanation:
5+7 =12
12 x 6 = 72
72+21= 93
[tex]6(5 + 7) + 21 = 93 \\ \\ 1. \: 6 \times 12 + 21 \\ 2. \: 72 + 21 \\ 3. \: = 93[/tex]
