Answer :
we can write an equation with the condition so:
[tex]7+x=2x[/tex]and we can solve for x so:
[tex]\begin{gathered} 7=2x-x \\ 7=x \end{gathered}[/tex]So the unknow number is 7
we can write an equation with the condition so:
[tex]7+x=2x[/tex]and we can solve for x so:
[tex]\begin{gathered} 7=2x-x \\ 7=x \end{gathered}[/tex]So the unknow number is 7