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Simplifying 55 = 0.2(285 + -10e) 55 = (285 * 0.2 + -10e * 0.2) 55 = (57 + -2e) Solving 55 = 57 + -2e Solving for variable 'e'. Move all terms containing e to the left, all other terms to the right. Add '2e' to each side of the equation. 55 + 2e = 57 + -2e + 2e Combine like terms: -2e + 2e = 0 55 + 2e = 57 + 0 55 + 2e = 57 Add '-55' to each side of the equation. 55 + -55 + 2e = 57 + -55 Combine like terms: 55 + -55 = 0 0 + 2e = 57 + -55 2e = 57 + -55 Combine like terms: 57 + -55 = 2 2e = 2 Divide each side by '2'. e = 1 Simplifying e = 1

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