Solve for x
x\leq 40
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510x\leq 21300-900
Subtract 900 from both sides.
510x\leq 20400
Subtract 900 from 21300 to get 20400.
x\leq \frac{20400}{510}
Divide both sides by 510. Since 510 is positive, the inequality direction remains the same.
x\leq 40
Divide 20400 by 510 to get 40.
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