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3x\geq 21-9
Subtract 9 from both sides.
3x\geq 12
Subtract 9 from 21 to get 12.
x\geq \frac{12}{3}
Divide both sides by 3. Since 3 is positive, the inequality direction remains the same.
x\geq 4
Divide 12 by 3 to get 4.