To solve the inequality \( x + 15 \geq 3 \), we need to isolate \( x \).
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Subtract 15 from both sides of the inequality:
\[ x + 15 - 15 \geq 3 - 15 \]
This simplifies to:
\[ x \geq -12 \]
The final inequality, with \( x \) first, is:
\[ x \geq -12 \]