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When rewriting inequalities using addition it's important to make the the same operation on both sides to ensure that the inequality still holds. So, if a number is added to one side, the same number must be added to the other side. In the inequality 5x-2≥ 13, 2 can be added on both sides. 5x-2 + 2≥ 13 + 2 ⇔ 5x≥ 15