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a . 2 (4x + 2y ) - (3x -y )
= 8x + 4y - 3x + y
= 8x - 3x + 4y + y
= 5x + 5y
b. 1/2 (4x + 2y ) + (3x -y )
= 2x + y + 3x - y
= 2x + 3x + y - y
= 5x