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Simplifying -12.9 + 3d = 5.7 Solving -12.9 + 3d = 5.7 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '12.9' to each side of the equation. -12.9 + 12.9 + 3d = 5.7 + 12.9 Combine like terms: -12.9 + 12.9 = 0.0 0.0 + 3d = 5.7 + 12.9 3d = 5.7 + 12.9 Combine like terms: 5.7 + 12.9 = 18.6 3d = 18.6 Divide each side by '3'. d = 6.2 Simplifying d = 6.2
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