3 times a number (taking x as the number) is represented as 3x.
7 times a number is represented as 7x.
If 3 times a number, 3x, is substracted from 7 times a number, 7x, the result is 44. That is represented as:
[tex]7x-3x=44[/tex]Solve the equation for x to find that number:
[tex]\begin{gathered} 7x-3x=44 \\ 4x=44 \\ x=\frac{44}{4} \\ x=11 \end{gathered}[/tex]The number is 11.