\end{cases}

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• \begin{cases}
• 4x - 5y = 20 \quad \text{(1)} \\
• 2x + 3y = -6 \quad \text{(2)}
• Multiply equation (2) by 2 to align the $ x $-terms:
• 4x + 6y = -12 \quad \text{(3)}
• Now subtract equation (1) from equation (3):

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