[tex]\displaystyle \left \{ {{x=y} \atop {x+2y=3}} \right. \\\\y+2y=3\\y=1\\x=1\\(x,y)=(1,1)[/tex]
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[tex]\displaystyle \left \{ {{x=y} \atop {x+2y=3}} \right. \\\\y+2y=3\\y=1\\x=1\\(x,y)=(1,1)[/tex]