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Simplifying 0.80r + 0.40d = 780 Reorder the terms: 0.40d + 0.80r = 780 Solving 0.40d + 0.80r = 780 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-0.80r' to each side of the equation. 0.40d + 0.80r + -0.80r = 780 + -0.80r Combine like terms: 0.80r + -0.80r = 0.00 0.40d + 0.00 = 780 + -0.80r 0.40d = 780 + -0.80r Divide each side by '0.40'. d = 1950 + -2r Simplifying d = 1950 + -2r
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