The answer is 20.
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5
Yes. One example of this is 5x4+3x3-x2+9.
(9x8)+(7x6)-(5x4)+((3+2)x1)
That's what the communtitive property is, changing the order. like 4+5=9; 5+4=9. So 4x5=20 and 5x4=20.
If AC equals 6 and BD equals 4, then AB equals 5.