September 2018 1 25 Report

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\left \{ {{2(x-1)-3(y+1)=0} \atop {\frac{x+1}{2}-\frac{x-y}{3}=1,5}} \right

\left \{ {{4(x-1)-5(y+2)=x-3y} \atop {\frac{x+y}{5}-\frac{1-y}{2}=y+\frac{x}{u}}} \right

c). \left \{ {{3x-y=1} \atop {y-3x=2}} \right


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