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Simplifying 7d = -2d Solving 7d = -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. 7d + 2d = -2d + 2d Combine like terms: 7d + 2d = 9d 9d = -2d + 2d Combine like terms: -2d + 2d = 0 9d = 0 Divide each side by '9'. d = 0 Simplifying d = 0
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