$$x \times \frac{ 1 }{ 4 } +x+ \frac{ 4 }{ 5 } =126$$
$x = \frac{2504}{25} = 100\frac{4}{25} = 100.16$
$$\frac{5}{4}x+\frac{4}{5}=126$$
$$\frac{5}{4}x=126-\frac{4}{5}$$
$$\frac{5}{4}x=\frac{630}{5}-\frac{4}{5}$$
$$\frac{5}{4}x=\frac{630-4}{5}$$
$$\frac{5}{4}x=\frac{626}{5}$$
$$x=\frac{626}{5}\times \frac{4}{5}$$
$$x=\frac{626\times 4}{5\times 5}$$
$$x=\frac{2504}{25}$$
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