$$8(2x-1)=21$$
$x = \frac{29}{16} = 1\frac{13}{16} = 1.8125$
$$2x-1=\frac{21}{8}$$
$$2x=\frac{21}{8}+1$$
$$2x=\frac{21}{8}+\frac{8}{8}$$
$$2x=\frac{21+8}{8}$$
$$2x=\frac{29}{8}$$
$$x=\frac{\frac{29}{8}}{2}$$
$$x=\frac{29}{8\times 2}$$
$$x=\frac{29}{16}$$
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