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Simplifying 9d + 3 = 3d + 21 Reorder the terms: 3 + 9d = 3d + 21 Reorder the terms: 3 + 9d = 21 + 3d Solving 3 + 9d = 21 + 3d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-3d' to each side of the equation. 3 + 9d + -3d = 21 + 3d + -3d Combine like terms: 9d + -3d = 6d 3 + 6d = 21 + 3d + -3d Combine like terms: 3d + -3d = 0 3 + 6d = 21 + 0 3 + 6d = 21 Add '-3' to each side of the equation. 3 + -3 + 6d = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 6d = 21 + -3 6d = 21 + -3 Combine like terms: 21 + -3 = 18 6d = 18 Divide each side by '6'. d = 3 Simplifying d = 3
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