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2.2x+2y-5x
= 3x² + (-15x) + 2x + (-10)
= 3x² -15x + 2x -10
= 3x² -13x -10
2.) 4x - 2y + 2x +5y - 7x - y = 4x + 2x -7x -2y + 5y -y
= -x + 2y