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Simplifying 5d + 2(6 + -1d) = 21 5d + (6 * 2 + -1d * 2) = 21 5d + (12 + -2d) = 21 Reorder the terms: 12 + 5d + -2d = 21 Combine like terms: 5d + -2d = 3d 12 + 3d = 21 Solving 12 + 3d = 21 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 3d = 21 + -12 Combine like terms: 12 + -12 = 0 0 + 3d = 21 + -12 3d = 21 + -12 Combine like terms: 21 + -12 = 9 3d = 9 Divide each side by '3'. d = 3 Simplifying d = 3
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