[tex]\displaystyle \left \{ {{2x+y=7} \atop {3x-y=3}} \right.\\ \\(2x+y)+(3x-y)=7+3\\5x=10\\x=2\\2(2)+y=7\\y=3\\(x,y)=(2,3)[/tex]
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[tex]\displaystyle \left \{ {{2x+y=7} \atop {3x-y=3}} \right.\\ \\(2x+y)+(3x-y)=7+3\\5x=10\\x=2\\2(2)+y=7\\y=3\\(x,y)=(2,3)[/tex]