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Simplifying 420 + 60d = 420 + -80d Add '-420' to each side of the equation. 420 + -420 + 60d = 420 + -420 + -80d Combine like terms: 420 + -420 = 0 0 + 60d = 420 + -420 + -80d 60d = 420 + -420 + -80d Combine like terms: 420 + -420 = 0 60d = 0 + -80d 60d = -80d Solving 60d = -80d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '80d' to each side of the equation. 60d + 80d = -80d + 80d Combine like terms: 60d + 80d = 140d 140d = -80d + 80d Combine like terms: -80d + 80d = 0 140d = 0 Divide each side by '140'. d = 0.0 Simplifying d = 0.0
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