Explicación paso a paso:
[tex]x + 2x + 4x = 210 \\ 3x + 4x = 210 \\ 7x = 210 \\ x = \frac{210}{7} \\ x = 30[/tex]
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Explicación paso a paso:
[tex]x + 2x + 4x = 210 \\ 3x + 4x = 210 \\ 7x = 210 \\ x = \frac{210}{7} \\ x = 30[/tex]