$$6-(4a-3)\ge8$$
$a\leq \frac{1}{4}$
$$6-4a-\left(-3\right)\geq 8$$
$$6-4a+3\geq 8$$
$$9-4a\geq 8$$
$$-4a\geq 8-9$$
$$-4a\geq -1$$
$$a\leq \frac{-1}{-4}$$
$$a\leq \frac{1}{4}$$
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