Solve for x
x\geq 500
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x\geq \frac{400}{0.8}
Divide both sides by 0.8. Since 0.8 is positive, the inequality direction remains the same.
x\geq \frac{4000}{8}
Expand \frac{400}{0.8} by multiplying both numerator and the denominator by 10.
x\geq 500
Divide 4000 by 8 to get 500.
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