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b. x - 2y
3 a. x³ + 5x² + x - 30
b. 2a³b + 2a²b² + 10a²b
4 b. 27x³ - 9x²y + 3xy² -y³
= 4x² + 2xy + 7x
b. 3(x - 2y) - (2x - 4y) = (3x - 6y) - (6x - 12y)
9x - 9xy - 12xy - 6y
hanya itu yg bisa aku jwab, maaf kalo salah