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=> 3x + 6x - 5y - y - 1
=> 9x - 6y - 1
B.) x² - 4xy - y² + xy
=> x² - 4xy + xy - y²
=> x² - 3xy - y²
C.) 10x² - 5xy + y² - 3xy - 5x² - 3
=> 10x² - 5x² - 5xy - 3xy + y² - 3
=> 5x² - 8xy + y² - 3
D.) -5p + 3pq + p - q
=> -5p + p + 3pq - q
=> -4p + 3pq - q