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Simplifying D(3) = 40(3) Reorder the terms for easier multiplication: 3D = 40(3) Multiply 40 * 3 3D = 120 Solving 3D = 120 Solving for variable 'D'. Move all terms containing D to the left, all other terms to the right. Divide each side by '3'. D = 40 Simplifying D = 40
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