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Simplifying 21 = e + 18 Reorder the terms: 21 = 18 + e Solving 21 = 18 + e Solving for variable 'e'. Move all terms containing e to the left, all other terms to the right. Add '-1e' to each side of the equation. 21 + -1e = 18 + e + -1e Combine like terms: e + -1e = 0 21 + -1e = 18 + 0 21 + -1e = 18 Add '-21' to each side of the equation. 21 + -21 + -1e = 18 + -21 Combine like terms: 21 + -21 = 0 0 + -1e = 18 + -21 -1e = 18 + -21 Combine like terms: 18 + -21 = -3 -1e = -3 Divide each side by '-1'. e = 3 Simplifying e = 3
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