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Simplifying 9d + 9 = 7d + 13 Reorder the terms: 9 + 9d = 7d + 13 Reorder the terms: 9 + 9d = 13 + 7d Solving 9 + 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. 9 + 9d + -7d = 13 + 7d + -7d Combine like terms: 9d + -7d = 2d 9 + 2d = 13 + 7d + -7d Combine like terms: 7d + -7d = 0 9 + 2d = 13 + 0 9 + 2d = 13 Add '-9' to each side of the equation. 9 + -9 + 2d = 13 + -9 Combine like terms: 9 + -9 = 0 0 + 2d = 13 + -9 2d = 13 + -9 Combine like terms: 13 + -9 = 4 2d = 4 Divide each side by '2'. d = 2 Simplifying d = 2
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