The given expression :
[tex]\frac{-2}{x-4}=\frac{4}{1-x}[/tex]
To solve the expression :
[tex]\begin{gathered} \frac{-2}{x-4}=\frac{4}{1-x} \\ \text{ Crossmultiply} \\ -2(1-x)=4(x-4) \\ -2+2x=4x-16 \\ 4x-2x=16-2 \\ 2x=14 \\ x=7 \end{gathered}[/tex]
Answer : x = 7
