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Simplify: 15² − 12²
81
9
339
15
Simplify: (9 + 4) × 2 − 2²
13
16
34
22
Simplify: 14² − 32²
1,192
288
-828
324
Find the missing number: 19 + ? × 4 = 51
18
12
8
Simplify: 60 + 9 × 9 − 45 ÷ 5
96
132
612
115