$$f ( \frac { x } { x } + \frac { x } { x } + \frac { x } { 1 } )$$
$f\left(x+2\right)$
$$f\left(1+\frac{x}{x}+\frac{x}{1}\right)$$
$$f\left(1+1+\frac{x}{1}\right)$$
$$f\left(2+\frac{x}{1}\right)$$
$$f\left(2+x\right)$$
$$2f+fx$$
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$fx+2f$
