Respuesta :

[tex]\begin{gathered} \text{Let the number be : x} \\ \text{Twice the number : 2x} \\ 2\text{x - 3 = x + 7} \\ 2\text{x - x = 7 + 3} \\ x\text{ = }\frac{10}{2}\text{ = 5} \\ \end{gathered}[/tex]

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