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Simplifying -3.9 = 2.6d + 1.56 Reorder the terms: -3.9 = 1.56 + 2.6d Solving -3.9 = 1.56 + 2.6d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-2.6d' to each side of the equation. -3.9 + -2.6d = 1.56 + 2.6d + -2.6d Combine like terms: 2.6d + -2.6d = 0.0 -3.9 + -2.6d = 1.56 + 0.0 -3.9 + -2.6d = 1.56 Add '3.9' to each side of the equation. -3.9 + 3.9 + -2.6d = 1.56 + 3.9 Combine like terms: -3.9 + 3.9 = 0.0 0.0 + -2.6d = 1.56 + 3.9 -2.6d = 1.56 + 3.9 Combine like terms: 1.56 + 3.9 = 5.46 -2.6d = 5.46 Divide each side by '-2.6'. d = -2.1 Simplifying d = -2.1
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