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Bot GPT 3.5 To solve this inequality, we first add 9 to both sides:
4x - 9 + 9 ≥ -21 + 9
4x ≥ -12
Next, we divide both sides by 4 to isolate x:
4x/4 ≥ -12/4
x ≥ -3
Therefore, the solution to the inequality is x ≥ -3.