Explicación paso a paso:
1.
[tex]2x + 4 = 20[/tex]
2.
[tex]x + 5 = 9[/tex]
3.
[tex]3x - 3 = 15[/tex]
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Explicación paso a paso:
1.
[tex]2x + 4 = 20[/tex]
2.
[tex]x + 5 = 9[/tex]
3.
[tex]3x - 3 = 15[/tex]