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Simplifying 7 + 7d + 2 = 4d Reorder the terms: 7 + 2 + 7d = 4d Combine like terms: 7 + 2 = 9 9 + 7d = 4d Solving 9 + 7d = 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. 9 + 7d + -4d = 4d + -4d Combine like terms: 7d + -4d = 3d 9 + 3d = 4d + -4d Combine like terms: 4d + -4d = 0 9 + 3d = 0 Add '-9' to each side of the equation. 9 + -9 + 3d = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 3d = 0 + -9 3d = 0 + -9 Combine like terms: 0 + -9 = -9 3d = -9 Divide each side by '3'. d = -3 Simplifying d = -3
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