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Simplifying d + 12d + 20 = 7 Reorder the terms: 20 + d + 12d = 7 Combine like terms: d + 12d = 13d 20 + 13d = 7 Solving 20 + 13d = 7 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 13d = 7 + -20 Combine like terms: 20 + -20 = 0 0 + 13d = 7 + -20 13d = 7 + -20 Combine like terms: 7 + -20 = -13 13d = -13 Divide each side by '13'. d = -1 Simplifying d = -1
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