[latex] \frac{16-x}{8} - \frac{18-x}{2}=0 [/latex]

[latex] \frac{16-x}{8} - \frac{18-x}{2} =0\; |\cdot 8\\\\16-x-4(18-x)=0\\\\16-x-72+4x=0\\\\3x=56\\\\x=\frac{56}{3}\\\\x=18\frac{2}{3}[/latex]