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Simplifying d + 12 = 20 + -3d Reorder the terms: 12 + d = 20 + -3d Solving 12 + d = 20 + -3d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '3d' to each side of the equation. 12 + d + 3d = 20 + -3d + 3d Combine like terms: d + 3d = 4d 12 + 4d = 20 + -3d + 3d Combine like terms: -3d + 3d = 0 12 + 4d = 20 + 0 12 + 4d = 20 Add '-12' to each side of the equation. 12 + -12 + 4d = 20 + -12 Combine like terms: 12 + -12 = 0 0 + 4d = 20 + -12 4d = 20 + -12 Combine like terms: 20 + -12 = 8 4d = 8 Divide each side by '4'. d = 2 Simplifying d = 2
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