\[ 2a + b = 6 \]

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• \( a + b = 5 \)
• \( 4a + 2b = 12 \)
• Divide the second equation by 2:
• Subtract the first equation from this:
• \[ (2a + b) - (a + b) = 6 - 5 \]
• Substitute \( a = 1 \) into \( a + b = 5 \):

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