$$E=\frac{-3}{4}+0.25$$
$E=-0.5$
$$E=-\frac{3}{4}+0.25$$
$$E=-\frac{3}{4}+\frac{1}{4}$$
$$E=\frac{-3+1}{4}$$
$$E=\frac{-2}{4}$$
$$E=-\frac{1}{2}$$
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$E≔-0.5$