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Simplifying 81 = 4e + 13 Reorder the terms: 81 = 13 + 4e Solving 81 = 13 + 4e Solving for variable 'e'. Move all terms containing e to the left, all other terms to the right. Add '-4e' to each side of the equation. 81 + -4e = 13 + 4e + -4e Combine like terms: 4e + -4e = 0 81 + -4e = 13 + 0 81 + -4e = 13 Add '-81' to each side of the equation. 81 + -81 + -4e = 13 + -81 Combine like terms: 81 + -81 = 0 0 + -4e = 13 + -81 -4e = 13 + -81 Combine like terms: 13 + -81 = -68 -4e = -68 Divide each side by '-4'. e = 17 Simplifying e = 17
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