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Simplifying 320.00 = 980.00(1 + -1d) 320.00 = (1 * 980.00 + -1d * 980.00) 320.00 = (980 + -980d) Solving 320.00 = 980 + -980d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '980d' to each side of the equation. 320.00 + 980d = 980 + -980d + 980d Combine like terms: -980d + 980d = 0 320.00 + 980d = 980 + 0 320.00 + 980d = 980 Add '-320.00' to each side of the equation. 320.00 + -320.00 + 980d = 980 + -320.00 Combine like terms: 320.00 + -320.00 = 0.00 0.00 + 980d = 980 + -320.00 980d = 980 + -320.00 Combine like terms: 980 + -320.00 = 660 980d = 660 Divide each side by '980'. d = 0.6734693878 Simplifying d = 0.6734693878
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