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Simplifying 2.1d + 7.8 = 15.15 Reorder the terms: 7.8 + 2.1d = 15.15 Solving 7.8 + 2.1d = 15.15 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-7.8' to each side of the equation. 7.8 + -7.8 + 2.1d = 15.15 + -7.8 Combine like terms: 7.8 + -7.8 = 0.0 0.0 + 2.1d = 15.15 + -7.8 2.1d = 15.15 + -7.8 Combine like terms: 15.15 + -7.8 = 7.35 2.1d = 7.35 Divide each side by '2.1'. d = 3.5 Simplifying d = 3.5
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