Respuesta :

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[tex]y - 8 = 10 - x[/tex]

Add sides 8

[tex]y - 8 + 8 = 10 - x + 8[/tex]

[tex]y = 18 - x[/tex]

Add sides x

[tex]y + x = 18 - x + x[/tex]

[tex]y + x = 18[/tex]

[tex]x + y = 18[/tex]

Done...

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