Solution:
This is a puzzle that plays with numbers in a non-standard way. The equations seem to follow a pattern rather than traditional arithmetic:
1 + 4 = 5 (1 × 1 + 4 = 5)
2 + 5 = 12 (2 × 2 + 5 = 12)
3 + 6 = 21 (3 × 3 + 6 = 21)
Following this pattern, where the first number is multiplied by itself and then added to the second number:
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