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Simplifying 280 = 830(1 + -1d) 280 = (1 * 830 + -1d * 830) 280 = (830 + -830d) Solving 280 = 830 + -830d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '830d' to each side of the equation. 280 + 830d = 830 + -830d + 830d Combine like terms: -830d + 830d = 0 280 + 830d = 830 + 0 280 + 830d = 830 Add '-280' to each side of the equation. 280 + -280 + 830d = 830 + -280 Combine like terms: 280 + -280 = 0 0 + 830d = 830 + -280 830d = 830 + -280 Combine like terms: 830 + -280 = 550 830d = 550 Divide each side by '830'. d = 0.6626506024 Simplifying d = 0.6626506024
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