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Simplifying 420 + 60d = 80d Solving 420 + 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. 420 + 60d + -80d = 80d + -80d Combine like terms: 60d + -80d = -20d 420 + -20d = 80d + -80d Combine like terms: 80d + -80d = 0 420 + -20d = 0 Add '-420' to each side of the equation. 420 + -420 + -20d = 0 + -420 Combine like terms: 420 + -420 = 0 0 + -20d = 0 + -420 -20d = 0 + -420 Combine like terms: 0 + -420 = -420 -20d = -420 Divide each side by '-20'. d = 21 Simplifying d = 21
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