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Simplifying 7d + -9d + 4d = 0 Combine like terms: 7d + -9d = -2d -2d + 4d = 0 Combine like terms: -2d + 4d = 2d 2d = 0 Solving 2d = 0 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Divide each side by '2'. d = 0 Simplifying d = 0
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