$$z1=3/2+1/4$$
$z_{1} = \frac{7}{4} = 1\frac{3}{4} = 1.75$
$$z_{1}=\frac{6}{4}+\frac{1}{4}$$
$$z_{1}=\frac{6+1}{4}$$
$$z_{1}=\frac{7}{4}$$
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$z_{1}≔\frac{7}{4}$