To solve the inequality \( 5x + 4 < 12 \), follow these steps:
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Subtract 4 from both sides: \[ 5x < 12 - 4 \] \[ 5x < 8 \]
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Divide both sides by 5: \[ x < \frac{8}{5} \]
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Simplify: \[ x < 1.6 \]
Thus, the solution to the inequality is: \[ x < 1.6 \]