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Simplifying 7e + 12 = 21 + 4e Reorder the terms: 12 + 7e = 21 + 4e Solving 12 + 7e = 21 + 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. 12 + 7e + -4e = 21 + 4e + -4e Combine like terms: 7e + -4e = 3e 12 + 3e = 21 + 4e + -4e Combine like terms: 4e + -4e = 0 12 + 3e = 21 + 0 12 + 3e = 21 Add '-12' to each side of the equation. 12 + -12 + 3e = 21 + -12 Combine like terms: 12 + -12 = 0 0 + 3e = 21 + -12 3e = 21 + -12 Combine like terms: 21 + -12 = 9 3e = 9 Divide each side by '3'. e = 3 Simplifying e = 3
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