first we pass the terms containing x to the right side of the equation with opposite sign, and we pass the other term to the left side of the equation( with opposite sign too))
[tex]8-16=\frac{1}{3}x[/tex]then we solve the left side of the equation
[tex]-8=\frac{1}{3}x[/tex]then we pass the 3 that is dividing to multiply the -8 in the left side
[tex]3(-8)=x[/tex]to finish, we solve the multiplication in the left side of the equation obtaining:
[tex]x=-24[/tex]