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b. 5X2 + 2X - 12 - 4X2 - 3X + 8
= 5x2 - 4x2 + 2x - 3x -12 + 8
= X2 - 3x - 4
c. X2Y - X2 + 3X2Y - X2Y + 5X2 + 3XY2
= X2Y - X2Y - X2 + 5X2 + 3X2Y + 3X2Y
= 4X2 + 6X2Y
usahakan angka yg memiliki varibel di sebelahin biar gampang menghitungnya