$$h \frac { 2 + h + h } { n + 30 + 4 n }$$
$\frac{2h\left(h+1\right)}{5\left(n+6\right)}$
$$h\times \frac{2+2h}{n+30+4n}$$
$$h\times \frac{2+2h}{5n+30}$$
$$\frac{h\left(2+2h\right)}{5n+30}$$
$$\frac{2h+2h^{2}}{5n+30}$$
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$\frac{2\left(h^{2}+h\right)}{5\left(n+6\right)}$