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= 7x + 15y - (5x - 9y)
= 7x + 15y - 5x + 9y
= 7x - 5x + 15y + 9y
= 2x + 24y
b. 5x - 3y + 7 dari 5y - 3x - 4
= 5y - 3x - 4 - (5x - 3y + 7)
= 5y - 3x - 4 - 5x + 3y - 7
= -3x - 5x + 5y + 3y - 4 - 7
= -8x + 8y - 11
c. -x² + 6xy + 3y² dari 5x² - 9xy - 4y²
= 5x² - 9xy - 4y² - ( -x² + 6xy + 3y²)
= 5x² - 9xy - 4y² + x² - 6xy - 3y²
= 5x² + x² - 4y² - 3y² - 9xy - 6xy
= 6x² - 7y² - 15xy