$$[\frac{10}{20(21)}{x}]+2[\frac{20(21)}{2}]-60$$
$\frac{x}{42}+360$
$$\frac{10}{420}x+2\times \frac{20\times 21}{2}-60$$
$$\frac{1}{42}x+2\times \frac{20\times 21}{2}-60$$
$$\frac{1}{42}x+2\times \frac{420}{2}-60$$
$$\frac{1}{42}x+2\times 210-60$$
$$\frac{1}{42}x+420-60$$
$$\frac{1}{42}x+360$$
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$\frac{x+15120}{42}$
$$factor(\frac{10}{420}x+2\times \frac{20\times 21}{2}-60)$$
$$factor(\frac{1}{42}x+2\times \frac{20\times 21}{2}-60)$$
$$factor(\frac{1}{42}x+2\times \frac{420}{2}-60)$$
$$factor(\frac{1}{42}x+2\times 210-60)$$
$$factor(\frac{1}{42}x+420-60)$$
$$factor(\frac{1}{42}x+360)$$
$$\frac{x+15120}{42}$$
