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Simplifying 13d + 9 = 7d + 27 Reorder the terms: 9 + 13d = 7d + 27 Reorder the terms: 9 + 13d = 27 + 7d Solving 9 + 13d = 27 + 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 + 13d + -7d = 27 + 7d + -7d Combine like terms: 13d + -7d = 6d 9 + 6d = 27 + 7d + -7d Combine like terms: 7d + -7d = 0 9 + 6d = 27 + 0 9 + 6d = 27 Add '-9' to each side of the equation. 9 + -9 + 6d = 27 + -9 Combine like terms: 9 + -9 = 0 0 + 6d = 27 + -9 6d = 27 + -9 Combine like terms: 27 + -9 = 18 6d = 18 Divide each side by '6'. d = 3 Simplifying d = 3
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