# How do you solve #1 - 4a > 21#?

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To solve the inequality 1 - 4a > 21, first, subtract 1 from both sides: -4a > 20. Then, divide both sides by -4, remembering to reverse the inequality sign because you're dividing by a negative number: a < -5. So, the solution is a is less than -5.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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