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Simplifying 7d + 4 = 5d + 20 Reorder the terms: 4 + 7d = 5d + 20 Reorder the terms: 4 + 7d = 20 + 5d Solving 4 + 7d = 20 + 5d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-5d' to each side of the equation. 4 + 7d + -5d = 20 + 5d + -5d Combine like terms: 7d + -5d = 2d 4 + 2d = 20 + 5d + -5d Combine like terms: 5d + -5d = 0 4 + 2d = 20 + 0 4 + 2d = 20 Add '-4' to each side of the equation. 4 + -4 + 2d = 20 + -4 Combine like terms: 4 + -4 = 0 0 + 2d = 20 + -4 2d = 20 + -4 Combine like terms: 20 + -4 = 16 2d = 16 Divide each side by '2'. d = 8 Simplifying d = 8
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