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Simplifying 139 = 3d + 2(4d + 9) Reorder the terms: 139 = 3d + 2(9 + 4d) 139 = 3d + (9 * 2 + 4d * 2) 139 = 3d + (18 + 8d) Reorder the terms: 139 = 18 + 3d + 8d Combine like terms: 3d + 8d = 11d 139 = 18 + 11d Solving 139 = 18 + 11d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-11d' to each side of the equation. 139 + -11d = 18 + 11d + -11d Combine like terms: 11d + -11d = 0 139 + -11d = 18 + 0 139 + -11d = 18 Add '-139' to each side of the equation. 139 + -139 + -11d = 18 + -139 Combine like terms: 139 + -139 = 0 0 + -11d = 18 + -139 -11d = 18 + -139 Combine like terms: 18 + -139 = -121 -11d = -121 Divide each side by '-11'. d = 11 Simplifying d = 11
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