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Simplifying 9d + 7 = 7d + 13 Reorder the terms: 7 + 9d = 7d + 13 Reorder the terms: 7 + 9d = 13 + 7d Solving 7 + 9d = 13 + 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. 7 + 9d + -7d = 13 + 7d + -7d Combine like terms: 9d + -7d = 2d 7 + 2d = 13 + 7d + -7d Combine like terms: 7d + -7d = 0 7 + 2d = 13 + 0 7 + 2d = 13 Add '-7' to each side of the equation. 7 + -7 + 2d = 13 + -7 Combine like terms: 7 + -7 = 0 0 + 2d = 13 + -7 2d = 13 + -7 Combine like terms: 13 + -7 = 6 2d = 6 Divide each side by '2'. d = 3 Simplifying d = 3
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