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2. 7x + 5y - 2x = 5x + 5y = 5 ( x + y )
3. 7x² - 4x² + 3y - 6y = 3x² - 3y = 3 ( x² - y )
4. 15 + 3(x-2) = 15 + 3x -6 = 9 + 3x = 3 ( 3 + x )
5. 10x - (3-2x) = 10x -3+ 2x = 8x - 3
6. 5x - 10y -6x + 3y = -x - 7y = -(x+7y)