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Simplifying 8d + 1 = 7d + -20 Reorder the terms: 1 + 8d = 7d + -20 Reorder the terms: 1 + 8d = -20 + 7d Solving 1 + 8d = -20 + 7d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-7d' to each side of the equation. 1 + 8d + -7d = -20 + 7d + -7d Combine like terms: 8d + -7d = 1d 1 + 1d = -20 + 7d + -7d Combine like terms: 7d + -7d = 0 1 + 1d = -20 + 0 1 + 1d = -20 Add '-1' to each side of the equation. 1 + -1 + 1d = -20 + -1 Combine like terms: 1 + -1 = 0 0 + 1d = -20 + -1 1d = -20 + -1 Combine like terms: -20 + -1 = -21 1d = -21 Divide each side by '1'. d = -21 Simplifying d = -21
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