What is the number of the variable X?

Answer:
[tex]\huge\boxed{x = -18}[/tex]
Step-by-step explanation:
[tex]\frac{x-3}{3} = \frac{2x+1}{5} \\\\Cross \ Multiplying\\\\3(2x+1) = 5(x-3) \\\\Resolving \ Parenthesis\\\\6x+3 = 5x-15\\\\Combining \ like \ terms\\\\6x-5x = -15-3\\\\\bold{x = -18}[/tex]
Hope this helped!