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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This simplifies to:
\[ x \geq -12 \]
The solution to the inequality is:
\[ x \geq -12 \]
This means that \( x \) can be any number greater than or equal to \(-12\).