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Simplifying 9D + 7 = 3D + 55 Reorder the terms: 7 + 9D = 3D + 55 Reorder the terms: 7 + 9D = 55 + 3D Solving 7 + 9D = 55 + 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. 7 + 9D + -3D = 55 + 3D + -3D Combine like terms: 9D + -3D = 6D 7 + 6D = 55 + 3D + -3D Combine like terms: 3D + -3D = 0 7 + 6D = 55 + 0 7 + 6D = 55 Add '-7' to each side of the equation. 7 + -7 + 6D = 55 + -7 Combine like terms: 7 + -7 = 0 0 + 6D = 55 + -7 6D = 55 + -7 Combine like terms: 55 + -7 = 48 6D = 48 Divide each side by '6'. D = 8 Simplifying D = 8
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