If the numbers 15 and 21 are interchanged, then which of the following equations will be correctly balanced?

1
26 + 21 × 15 ÷ 3 - 14 = 108
2
24 - 21 ÷ 3 + 15 - 7 = 23
3
62 ÷ 31 - 21 + 15 × 3 = 80
4
63 ÷ 15 + 21 × 5 - 4 = 74

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