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a) 2x + 3y(4x - 5y) + 7x - 1 = 2x + 12xy - 15y^2 + 7x -1 = -15y^2 + 12xy + 9x -1
b) 3x - (4x+1) + 5y - 4x + y = 3x - 4x - 1 + 5y - 4x + y = -5x + 6y - 1
maaf kalau salah yaa