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Simplifying d + -1d + 2d = 12 Combine like terms: d + -1d = 0 0 + 2d = 12 2d = 12 Solving 2d = 12 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Divide each side by '2'. d = 6 Simplifying d = 6
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