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Simplifying 0.20 * 89 + 0.50 * 97 + 0.30E = 0 Multiply 0.20 * 89 17.8 + 0.50 * 97 + 0.30E = 0 Multiply 0.50 * 97 17.8 + 48.5 + 0.30E = 0 Combine like terms: 17.8 + 48.5 = 66.3 66.3 + 0.30E = 0 Solving 66.3 + 0.30E = 0 Solving for variable 'E'. Move all terms containing E to the left, all other terms to the right. Add '-66.3' to each side of the equation. 66.3 + -66.3 + 0.30E = 0 + -66.3 Combine like terms: 66.3 + -66.3 = 0.0 0.0 + 0.30E = 0 + -66.3 0.30E = 0 + -66.3 Combine like terms: 0 + -66.3 = -66.3 0.30E = -66.3 Divide each side by '0.30'. E = -221 Simplifying E = -221
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