$$x^{3}-x^{2}x-19\frac{x}{4}\frac{2}{14}20-3x+4x^{2}x^{3}$$
$4x^{5}-\frac{116x}{7}$
$$x^{3}-x^{3}-19\times \frac{x}{4}\times \frac{2}{14}\times 20-3x+4x^{2}x^{3}$$
$$x^{3}-x^{3}-19\times \frac{x}{4}\times \frac{2}{14}\times 20-3x+4x^{5}$$
$$0-19\times \frac{x}{4}\times \frac{2}{14}\times 20-3x+4x^{5}$$
$$0-19\times \frac{x}{4}\times \frac{1}{7}\times 20-3x+4x^{5}$$
$$0-\frac{19}{7}\times \frac{x}{4}\times 20-3x+4x^{5}$$
$$0-\frac{380}{7}\times \frac{x}{4}-3x+4x^{5}$$
$$0-\frac{380x}{7\times 4}-3x+4x^{5}$$
$$0-\frac{95x}{7}-3x+4x^{5}$$
$$-\frac{95x}{7}-3x+4x^{5}$$
$$-\frac{95x}{7}+\frac{7\left(-3x+4x^{5}\right)}{7}$$
$$\frac{-95x+7\left(-3x+4x^{5}\right)}{7}$$
$$\frac{-95x-21x+28x^{5}}{7}$$
$$\frac{-116x+28x^{5}}{7}$$
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$\frac{4x\left(7x^{4}-29\right)}{7}$
$$\frac{7x^{3}-7x^{2}x-95x-21x+28x^{2}x^{3}}{7}$$
$$x\left(-116+28x^{4}\right)$$
$$28x^{4}-116$$
$$4\left(7x^{4}-29\right)$$
$$\frac{4x\left(7x^{4}-29\right)}{7}$$
