Respuesta :

So here we have the equation:

(Let "x" be the number).

[tex]12\cdot x+6=6\cdot15[/tex]

This is:

[tex]\begin{gathered} 12x+6=90 \\ 12x=90-6 \\ 12x=84 \\ x=\frac{84}{12}=7 \\ x=7 \end{gathered}[/tex]