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Simplifying 3d + 18 = 39 + -4d Reorder the terms: 18 + 3d = 39 + -4d Solving 18 + 3d = 39 + -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. 18 + 3d + 4d = 39 + -4d + 4d Combine like terms: 3d + 4d = 7d 18 + 7d = 39 + -4d + 4d Combine like terms: -4d + 4d = 0 18 + 7d = 39 + 0 18 + 7d = 39 Add '-18' to each side of the equation. 18 + -18 + 7d = 39 + -18 Combine like terms: 18 + -18 = 0 0 + 7d = 39 + -18 7d = 39 + -18 Combine like terms: 39 + -18 = 21 7d = 21 Divide each side by '7'. d = 3 Simplifying d = 3
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