(5x - 4y) - (5y - 4x) is equal to:
9(x - y)
x - y
(y - x)
0
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(5x - 4y) - (5y - 4x)
= 5x - 4y - 5y + 4x
= (5x + 4x) + (-4x - 5y)
= 9x + (- 9y)
= 9x - 9y
= 9(x - y)
Hence, option 1 is the correct option.
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The area of a rectangle is x3 - 8x2 + 7 and one of its sides is x - 1. Find the length of the adjacent side.