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3x + 2x - 2y + y → 5x + y.
b. 2x - 5xy - 4x + 9xy = -2x + 4xy (benar)
2x - 4x - 5xy + 9xy → -2x + 4xy.
d. 7(x + y) - 3(x + y) - 2(x + 4y) = 2x + 4y (salah)
7x + 7y - 3x - 3y - 2x - 8y
→ 7x - 3x - 2x + 7y - 3y - 8y = 2x - 4y.