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Mathematics for IGCSE & O level - Algebraic Manipulation (Section 7 - No. 25)

What is the simplified form of 3(a+b) - (a-b)?
2a + 4b
2a + 2b
4a + 2b
4a + 4b

Explanation

3a + 3b - a + b = 2a + 4b

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