The following equation is incorrect. Which two signs should be interchanged to correct the equation?
20 ÷ 14 + 5 x 20 - 2 = 56
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18 + 12 ÷ 9 - 30 x 16 = 10
16 ÷ 8 - 5 x 2 + 6 = 9
14 ÷ 10 x 20 - 40 + 34 = 1
12 ÷ 4 - 15 x 10 + 2 = 8
1 ÷ 14 x 30 + 20 - 10 = 12
18 x 12 - 6 ÷ 5 + 4 = 35
If 9&4 = 50, 3&7 = -40 and 7&5 = 20, then find the value of 4&5 = ?