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= (8 × 3x + 8 × 4y) (- 5 × 4x + - 5 × -8y)
= 24x + 32y - 20x + 40y
= 24x - 20x + 32y + 40y
= 4x + 72y
( 24x + 32y ) - ( -20x + 40y ) =
24x - (-20x) + 32y - 40y
= 44x - 8y
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