$\"\"$

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The equations are

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$\"\"$

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$\"\"$

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$\"\"$

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Multiply the equation (2) by 5.

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$\"\"$

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$\"\"$

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Subtract equation (4) and Equation (3).

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$\"\"$

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Multiply the equation (1) by 9.

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$\"\"$

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Subtract equation (5) and Equation (4).

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$\"\"$ $\"\"$

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Divide each side by negative 63.

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$\"\"$

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$\"\"$

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$\"\"$

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Substitute $\"\"$ in equation (5).

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$\"\"$

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$\"\"$

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Subtract 54 from each side.

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$\"\"$

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$\"\"$

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$\"\"$

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Divide each side by 27.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Substitute $\"\"$ and $\"\"$ in equation (2).

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$\"\"$

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$\"\"$

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$\"\"$

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Subtract 14 from each side.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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The solution is $\"\"$ .