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Simplifying (e + 3) * 3 = 21 Reorder the terms: (3 + e) * 3 = 21 Reorder the terms for easier multiplication: 3(3 + e) = 21 (3 * 3 + e * 3) = 21 (9 + 3e) = 21 Solving 9 + 3e = 21 Solving for variable 'e'. Move all terms containing e to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 3e = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 3e = 21 + -9 3e = 21 + -9 Combine like terms: 21 + -9 = 12 3e = 12 Divide each side by '3'. e = 4 Simplifying e = 4
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