To solve the inequality \( 6(2.5x - 8) \geq 42 \), follow these steps:
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Distribute the 6: \[ 15x - 48 \geq 42 \]
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Add 48 to both sides: \[ 15x \geq 42 + 48 \] \[ 15x \geq 90 \]
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Divide both sides by 15: \[ x \geq \frac{90}{15} \] \[ x \geq 6 \]
So the solution to the inequality is: \[ \boxed{x \geq 6} \]