Answer
$n\leq3$
Work Step by Step
$12n\leq3n+27\longrightarrow$ subtract 3n from each side
$12n-3n\leq3n+27-3n\longrightarrow$ subtract
$9n\leq27\longrightarrow$ divide each side by 9
$9n\div9\leq27\div9\longrightarrow$ divide
$n\leq3$
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