The simplified system is the arbitrary solution of the original system of equations.

Reorder <math><mstyle displaystyle="true"><mo>-</mo><mfrac><mrow><mn>66</mn></mrow><mrow><mn>5</mn></mrow></mfrac></mstyle></math> and <math><mstyle displaystyle="true"><mo>-</mo><mfrac><mrow><mn>7</mn><mi>x</mi></mrow><mrow><mn>5</mn></mrow></mfrac></mstyle></math> .

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