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Simplifying 15d + -8d + 13 = 55 Reorder the terms: 13 + 15d + -8d = 55 Combine like terms: 15d + -8d = 7d 13 + 7d = 55 Solving 13 + 7d = 55 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 7d = 55 + -13 Combine like terms: 13 + -13 = 0 0 + 7d = 55 + -13 7d = 55 + -13 Combine like terms: 55 + -13 = 42 7d = 42 Divide each side by '7'. d = 6 Simplifying d = 6
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