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Simplifying 25 + 20d = 165 Solving 25 + 20d = 165 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + 20d = 165 + -25 Combine like terms: 25 + -25 = 0 0 + 20d = 165 + -25 20d = 165 + -25 Combine like terms: 165 + -25 = 140 20d = 140 Divide each side by '20'. d = 7 Simplifying d = 7
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