Which of the following equations is correct when the numbers 3 and 9 are interchanged and the signs - and × are interchanged?

1
12 ÷ 9 - 2 × 7 + 3 = 10
2
1 - 9 × 10 ÷ 4 + 3 = 32
3
9 ÷ 2 × 1 - 3 + 5 = 15
4
9 ÷ 4 × 3 + 1 - 6 = 18

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