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Simplifying 420 + -3d = 2d Solving 420 + -3d = 2d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-2d' to each side of the equation. 420 + -3d + -2d = 2d + -2d Combine like terms: -3d + -2d = -5d 420 + -5d = 2d + -2d Combine like terms: 2d + -2d = 0 420 + -5d = 0 Add '-420' to each side of the equation. 420 + -420 + -5d = 0 + -420 Combine like terms: 420 + -420 = 0 0 + -5d = 0 + -420 -5d = 0 + -420 Combine like terms: 0 + -420 = -420 -5d = -420 Divide each side by '-5'. d = 84 Simplifying d = 84
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