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Simplifying 7d + 4 = 4d + 13 Reorder the terms: 4 + 7d = 4d + 13 Reorder the terms: 4 + 7d = 13 + 4d Solving 4 + 7d = 13 + 4d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-4d' to each side of the equation. 4 + 7d + -4d = 13 + 4d + -4d Combine like terms: 7d + -4d = 3d 4 + 3d = 13 + 4d + -4d Combine like terms: 4d + -4d = 0 4 + 3d = 13 + 0 4 + 3d = 13 Add '-4' to each side of the equation. 4 + -4 + 3d = 13 + -4 Combine like terms: 4 + -4 = 0 0 + 3d = 13 + -4 3d = 13 + -4 Combine like terms: 13 + -4 = 9 3d = 9 Divide each side by '3'. d = 3 Simplifying d = 3
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