If the replacement set is the set of real numbers,
solve : $8 - 3 x \leq 20$

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Solution

$8 - 3 x \leq 20$
$- 12 \leq 3 x$
$3 x \geq - 12$
$x \geq - 4$
$x ε [- 4, \infty)$

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