\[ a = \frac{1}{2} \]

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• \[ 5a + b = 2 \] — (Equation 5)
• \[ (5a + b) - (3a + b) = 2 - 1 \]
• \[ 2a = 1 \]
• \[ 3\left(\frac{1}{2}\right) + b = 1 \]
• \[ \frac{3}{2} + b = 1 \]
• \[ b = 1 - \frac{3}{2} = -\frac{1}{2} \]

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