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( 5x + 4y ) ( 2x - 3y )
10x² - 7xy - 12y² = (5x + 4y)(2x - 3y)
check : (5x + 4y)(2x - 3y) = 10x² - 15xy + 8xy - 12y² = 10x² - 7xy -12y² (BENAR)
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