[tex]\displaystyle\\\left \{ {{2x+y=8} \atop {2x-y=0}} \right. \\\\2x+2x+y-y=8\\4x=8\\x=2= > y=4[/tex]
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[tex]\displaystyle\\\left \{ {{2x+y=8} \atop {2x-y=0}} \right. \\\\2x+2x+y-y=8\\4x=8\\x=2= > y=4[/tex]