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Simplifying 1 + 2.5d = 3d + -4 Reorder the terms: 1 + 2.5d = -4 + 3d Solving 1 + 2.5d = -4 + 3d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-3d' to each side of the equation. 1 + 2.5d + -3d = -4 + 3d + -3d Combine like terms: 2.5d + -3d = -0.5d 1 + -0.5d = -4 + 3d + -3d Combine like terms: 3d + -3d = 0 1 + -0.5d = -4 + 0 1 + -0.5d = -4 Add '-1' to each side of the equation. 1 + -1 + -0.5d = -4 + -1 Combine like terms: 1 + -1 = 0 0 + -0.5d = -4 + -1 -0.5d = -4 + -1 Combine like terms: -4 + -1 = -5 -0.5d = -5 Divide each side by '-0.5'. d = 10 Simplifying d = 10
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