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soal A
( 7x + 15y) - ( 5x - 9y )
= 7x + 15y -5x + 9y
= 2x + 24y
soal B
(5y -3x - 4) - ( 5x - 3y)
= 5y -3x -4 -5x + 3y
= 8y -8x - 4
soal C
( 5x² - 9xy -4y²) - (-x²+6xy + 3y²)
= 5x² - 9xy -4y² + x² -6xy - 3y²
= 6x² -15xy - 7y²