$$\frac{15}{20}+\frac{42}{30}-\frac{56}{40}$$
$\frac{3}{4}=0.75$
$$\frac{3}{4}+\frac{42}{30}-\frac{56}{40}$$
$$\frac{3}{4}+\frac{7}{5}-\frac{56}{40}$$
$$\frac{15}{20}+\frac{28}{20}-\frac{56}{40}$$
$$\frac{15+28}{20}-\frac{56}{40}$$
$$\frac{43}{20}-\frac{56}{40}$$
$$\frac{43}{20}-\frac{7}{5}$$
$$\frac{43}{20}-\frac{28}{20}$$
$$\frac{43-28}{20}$$
$$\frac{15}{20}$$
$$\frac{3}{4}$$
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$\frac{3}{2 ^ {2}} = 0.75$
