$$\frac{ y1 }{ 2 } x+2$$
$\frac{xy_{1}}{2}+2$
$$\frac{y_{1}x}{2}+2$$
$$\frac{y_{1}x}{2}+\frac{2\times 2}{2}$$
$$\frac{y_{1}x+2\times 2}{2}$$
$$\frac{y_{1}x+4}{2}$$
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$\frac{xy_{1}+4}{2}$
