[tex]x=5k+2\\y=5l+3[/tex]
gdzie [tex]k,l\in\mathbb{Z}[/tex]
[tex]x+y=5k+2+5l+3=5(k+l+1)[/tex]
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[tex]x=5k+2\\y=5l+3[/tex]
gdzie [tex]k,l\in\mathbb{Z}[/tex]
[tex]x+y=5k+2+5l+3=5(k+l+1)[/tex]