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Simplifying 3x3 + 5x2 + -400d + -18000 = 0 Reorder the terms: -18000 + -400d + 5x2 + 3x3 = 0 Solving -18000 + -400d + 5x2 + 3x3 = 0 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '18000' to each side of the equation. -18000 + -400d + 5x2 + 18000 + 3x3 = 0 + 18000 Reorder the terms: -18000 + 18000 + -400d + 5x2 + 3x3 = 0 + 18000 Combine like terms: -18000 + 18000 = 0 0 + -400d + 5x2 + 3x3 = 0 + 18000 -400d + 5x2 + 3x3 = 0 + 18000 Combine like terms: 0 + 18000 = 18000 -400d + 5x2 + 3x3 = 18000 Add '-5x2' to each side of the equation. -400d + 5x2 + -5x2 + 3x3 = 18000 + -5x2 Combine like terms: 5x2 + -5x2 = 0 -400d + 0 + 3x3 = 18000 + -5x2 -400d + 3x3 = 18000 + -5x2 Add '-3x3' to each side of the equation. -400d + 3x3 + -3x3 = 18000 + -5x2 + -3x3 Combine like terms: 3x3 + -3x3 = 0 -400d + 0 = 18000 + -5x2 + -3x3 -400d = 18000 + -5x2 + -3x3 Divide each side by '-400'. d = -45 + 0.0125x2 + 0.0075x3 Simplifying d = -45 + 0.0125x2 + 0.0075x3
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