September 2018 1 10 Report

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a)\begin{cases} x+y=20\\2x+3y=52 \end{cases} b)\begin{cases} 2x+y=16\\5x-6y=0 \end{cases} c)\begin{cases} x+y=50\\\frac{x}{2}-\frac{x}{3}=0 \end{cases}


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