$$\frac{1}{7}\times1\frac{3}{5}-1\frac{1}{5}\div2\frac{1}{4}$$
$-\frac{32}{105}\approx -0.304761905$
$$\frac{1}{7}\times \frac{5+3}{5}-\frac{\frac{1\times 5+1}{5}}{\frac{2\times 4+1}{4}}$$
$$\frac{1}{7}\times \frac{8}{5}-\frac{\frac{1\times 5+1}{5}}{\frac{2\times 4+1}{4}}$$
$$\frac{1\times 8}{7\times 5}-\frac{\frac{1\times 5+1}{5}}{\frac{2\times 4+1}{4}}$$
$$\frac{8}{35}-\frac{\frac{1\times 5+1}{5}}{\frac{2\times 4+1}{4}}$$
$$\frac{8}{35}-\frac{\left(1\times 5+1\right)\times 4}{5\left(2\times 4+1\right)}$$
$$\frac{8}{35}-\frac{\left(5+1\right)\times 4}{5\left(2\times 4+1\right)}$$
$$\frac{8}{35}-\frac{6\times 4}{5\left(2\times 4+1\right)}$$
$$\frac{8}{35}-\frac{24}{5\left(2\times 4+1\right)}$$
$$\frac{8}{35}-\frac{24}{5\left(8+1\right)}$$
$$\frac{8}{35}-\frac{24}{5\times 9}$$
$$\frac{8}{35}-\frac{24}{45}$$
$$\frac{8}{35}-\frac{8}{15}$$
$$\frac{24}{105}-\frac{56}{105}$$
$$\frac{24-56}{105}$$
$$-\frac{32}{105}$$
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$-\frac{32}{105} = -0.3047619047619048$
