5. A shoe store is offering shoes that regularly sell for $80.00 at a 25% discount. Halfway through the sale, the manager realises that the discount percentage is too high, so she must increase the regular price of the shoes and the discount by the same amount so that the discount equals 18%. Write an equation that can be used to solve for, the amount that must be added to both the discount and the regular price to equal the new discount percentage.

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