\left \{ {{x+y=3\atop 2x+y=3\right. \left \{ {{3x+3y=9\atop x+y=2\right. \left \{ {{3x+2y=3\atop 4x+2=0\right. \left \{ {{3x+3y=9\atop x+y=2\right. \left \{ {{3x+2y=3\atop 4x+2=0\right.
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