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Mathematics for IGCSE & O level - Algebraic Manipulation (Section 6 - No. 50)

What is the simplified expression of 2x + 3y - x + y?
3x + 4y
x + 4y
3x + 2y
x + 2y

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Combining like terms (2x - x) + (3y + y) = x + 4y

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