Is it possible to isolate x in the following: f(x) = -4 +2x / 5 + x? If so, how?
Rewrite:
$\displaystyle y=\frac{-4+2x}{5+x}$
$\displaystyle \Leftrightarrow y(5+x)=-4+2x$
$\displaystyle \Leftrightarrow 5y+yx=-4+2x$
$\displaystyle \Leftrightarrow 2x-yx=5y+4$
$\displaystyle \Leftrightarrow x(2-y)=5y+4$
$\displaystyle \Leftrightarrow x=...$