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Simplifying 4d + 12 = d + 21 Reorder the terms: 12 + 4d = d + 21 Reorder the terms: 12 + 4d = 21 + d Solving 12 + 4d = 21 + d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-1d' to each side of the equation. 12 + 4d + -1d = 21 + d + -1d Combine like terms: 4d + -1d = 3d 12 + 3d = 21 + d + -1d Combine like terms: d + -1d = 0 12 + 3d = 21 + 0 12 + 3d = 21 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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