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Simplifying 420 + 60d + -80d = 420 + -60d Combine like terms: 60d + -80d = -20d 420 + -20d = 420 + -60d Add '-420' to each side of the equation. 420 + -420 + -20d = 420 + -420 + -60d Combine like terms: 420 + -420 = 0 0 + -20d = 420 + -420 + -60d -20d = 420 + -420 + -60d Combine like terms: 420 + -420 = 0 -20d = 0 + -60d -20d = -60d Solving -20d = -60d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '60d' to each side of the equation. -20d + 60d = -60d + 60d Combine like terms: -20d + 60d = 40d 40d = -60d + 60d Combine like terms: -60d + 60d = 0 40d = 0 Divide each side by '40'. d = 0.0 Simplifying d = 0.0
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