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12+6-9+3\times 7=3+6-9+21
Add 9 and 3 to get 12.
18-9+3\times 7=3+6-9+21
Add 12 and 6 to get 18.
9+3\times 7=3+6-9+21
Subtract 9 from 18 to get 9.
9+21=3+6-9+21
Multiply 3 and 7 to get 21.
30=3+6-9+21
Add 9 and 21 to get 30.
30=9-9+21
Add 3 and 6 to get 9.
30=21
Subtract 9 from 9 to get 0.
\text{false}
Compare 30 and 21.
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