To solve the inequality \( x + 15 \geq 3 \), follow these steps:
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Subtract 15 from both sides of the inequality: \[ x + 15 - 15 \geq 3 - 15 \]
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Simplifying this gives: \[ x \geq -12 \]
Now, writing the inequality with \( x \) first, it becomes: \[ x \geq -12 \]
So the solution is \( x \geq -12 \).