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Simplifying x2 + 3d + 9 = 0 Reorder the terms: 9 + 3d + x2 = 0 Solving 9 + 3d + x2 = 0 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + 3d + -9 + x2 = 0 + -9 Reorder the terms: 9 + -9 + 3d + x2 = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 3d + x2 = 0 + -9 3d + x2 = 0 + -9 Combine like terms: 0 + -9 = -9 3d + x2 = -9 Add '-1x2' to each side of the equation. 3d + x2 + -1x2 = -9 + -1x2 Combine like terms: x2 + -1x2 = 0 3d + 0 = -9 + -1x2 3d = -9 + -1x2 Divide each side by '3'. d = -3 + -0.3333333333x2 Simplifying d = -3 + -0.3333333333x2
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