$$=\frac{3x\times v}{10-x\times120-4x}$$
$\frac{3vx}{2\left(5-62x\right)}$
$$\frac{3xv}{10-120x-4x}$$
$$\frac{3xv}{10-124x}$$
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$\frac{15v}{2\left(62x-5\right)^{2}}$
