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Simplifying 1420 = -680 + 420d Solving 1420 = -680 + 420d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-420d' to each side of the equation. 1420 + -420d = -680 + 420d + -420d Combine like terms: 420d + -420d = 0 1420 + -420d = -680 + 0 1420 + -420d = -680 Add '-1420' to each side of the equation. 1420 + -1420 + -420d = -680 + -1420 Combine like terms: 1420 + -1420 = 0 0 + -420d = -680 + -1420 -420d = -680 + -1420 Combine like terms: -680 + -1420 = -2100 -420d = -2100 Divide each side by '-420'. d = 5 Simplifying d = 5
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