The following equation is incorrect. Which two signs should be interchanged to correct the equation?
16 x 4 - 10 + 10 ÷ 6 = 54
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16 x 4 - 10 + 2 ÷ 12 = 18
40 ÷ 8 x 5 + 15 - 2 = 30
26 - 2 x 30 ÷ 6 + 16 = 20
13 - 14 ÷ 30 x 7 + 15 = 13
7 x 16 + 20 - 20 ÷ 10 = 31
If 3@7 = 20, 8@1 = 18 and 6@5 = 22, then find the value of 4@4 = ?
3 + 4 - 25 ÷ 2 x 12 = 41