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= (3x+5x)+(4x-2y)
= 3x + 5y + 4x - 2y
= 3x + 4x + 5y -2y
= 7x + 3y
b) A-B
= (3x+5y)-(4x-2y)
= 3x + 5y - 4x + 2y
= 3x - 4x + 5y + 2y
= -x + 7y