$$\sqrt{ 4 } m= \frac{ 4-5 }{ 2 }$$
$m=-\frac{1}{4}=-0.25$
$$2\sqrt{4}m=4-5$$
$$2\times 2m=4-5$$
$$4m=4-5$$
$$4m=-1$$
$$m=\frac{-1}{4}$$
$$m=-\frac{1}{4}$$
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