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3x^2 + x^2 + 2x - 5x -1 + 6
4x^2 - 3x +5
b. (2x + 4y -2xy) + ( 10x - 15y + 25xy).. kumpulkan variabel yang sejenis
2x + 10x + 4y -15y -2xy + 25xy
12x - 11y + 23xy