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Simplifying 9d + d + -4d + 9 = 2d Reorder the terms: 9 + 9d + d + -4d = 2d Combine like terms: 9d + d = 10d 9 + 10d + -4d = 2d Combine like terms: 10d + -4d = 6d 9 + 6d = 2d Solving 9 + 6d = 2d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-2d' to each side of the equation. 9 + 6d + -2d = 2d + -2d Combine like terms: 6d + -2d = 4d 9 + 4d = 2d + -2d Combine like terms: 2d + -2d = 0 9 + 4d = 0 Add '-9' to each side of the equation. 9 + -9 + 4d = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 4d = 0 + -9 4d = 0 + -9 Combine like terms: 0 + -9 = -9 4d = -9 Divide each side by '4'. d = -2.25 Simplifying d = -2.25
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