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Simplifying D + d + d + d + 12 = d + 30 Reorder the terms: 12 + D + d + d + d = d + 30 Combine like terms: d + d = 2d 12 + D + 2d + d = d + 30 Combine like terms: 2d + d = 3d 12 + D + 3d = d + 30 Reorder the terms: 12 + D + 3d = 30 + d Solving 12 + D + 3d = 30 + d Solving for variable 'D'. Move all terms containing D to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + D + -12 + 3d = 30 + -12 + d Reorder the terms: 12 + -12 + D + 3d = 30 + -12 + d Combine like terms: 12 + -12 = 0 0 + D + 3d = 30 + -12 + d D + 3d = 30 + -12 + d Combine like terms: 30 + -12 = 18 D + 3d = 18 + d Add '-3d' to each side of the equation. D + 3d + -3d = 18 + d + -3d Combine like terms: 3d + -3d = 0 D + 0 = 18 + d + -3d D = 18 + d + -3d Combine like terms: d + -3d = -2d D = 18 + -2d Simplifying D = 18 + -2d
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