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