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Simplifying 21 = -3e Solving 21 = -3e Solving for variable 'e'. Move all terms containing e to the left, all other terms to the right. Add '3e' to each side of the equation. 21 + 3e = -3e + 3e Combine like terms: -3e + 3e = 0 21 + 3e = 0 Add '-21' to each side of the equation. 21 + -21 + 3e = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 3e = 0 + -21 3e = 0 + -21 Combine like terms: 0 + -21 = -21 3e = -21 Divide each side by '3'. e = -7 Simplifying e = -7
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