Answer
$x\lt3$
Work Step by Step
$5x+3\lt18\longrightarrow$ subtract 3 from each side
$5x+3-3\lt18-3\longrightarrow$ subtract
$5x\lt15\longrightarrow$ divide each side by 5
$5x\div5\lt15\div5\longrightarrow$ divide
$x\lt3$
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