Explicación paso a paso:
[tex]7x = 20 + 3x \\ 7x - 3x = 20 \\ 4x = 20 \\ x = \frac{20}{4} \\ x = 5[/tex]
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Explicación paso a paso:
[tex]7x = 20 + 3x \\ 7x - 3x = 20 \\ 4x = 20 \\ x = \frac{20}{4} \\ x = 5[/tex]