September 2018 1 42 Report

1.\left \{ {{\frac{1}{2}(x-1)+y=-2\frac{1}{2}} \atop {x-7=1-y}} \right \ 2. \left \{ {{\frac{x-y}{3}- \frac{x+y}{2}=-\frac{1}{2} \atop {x+y=3}} 3.\left \{ {{x(x-6)-x(y+x)=y(3-x)} \atop {2x+y=0}} \right

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