$$\frac{7-x}{8}=\frac{3}{4}$$
$x=1$
$$7-x=\frac{3}{4}\times 8$$
$$7-x=\frac{3\times 8}{4}$$
$$7-x=\frac{24}{4}$$
$$7-x=6$$
$$-x=6-7$$
$$-x=-1$$
$$x=1$$
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