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5x - 9y - (7x + 5y)
5x - 7x - 9y - 5y
-2x - 14y (bisa disederhanakan jadi -x - 7y)
b
5x - 3y + 7 - (-3x + 5y - 4)
5x + 3x - 3y - 5y + 7 + 4
8x - 8y + 11
= 5x - 7x - 9y + 5y
= -2x - 14y
B. 5x - 3y + 7 - (-3x) + 5y - 4
= 5x + 3x - 3y - 5y + 7 + 4
= 8x - 8y + 11