[tex]x+y=4[/tex]
[tex]x + 0 = 4[/tex]
[tex]x = 4[/tex]
otra respuesta puede ser:
x+y=4
×+y-4=4-4
×+y-4=0
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[tex]x+y=4[/tex]
[tex]x + 0 = 4[/tex]
[tex]x = 4[/tex]
otra respuesta puede ser:
x+y=4
×+y-4=4-4
×+y-4=0