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Simplifying D2 + -21d + 20 = 0 Reorder the terms: 20 + D2 + -21d = 0 Solving 20 + D2 + -21d = 0 Solving for variable 'D'. Move all terms containing D to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + D2 + -20 + -21d = 0 + -20 Reorder the terms: 20 + -20 + D2 + -21d = 0 + -20 Combine like terms: 20 + -20 = 0 0 + D2 + -21d = 0 + -20 D2 + -21d = 0 + -20 Combine like terms: 0 + -20 = -20 D2 + -21d = -20 Add '21d' to each side of the equation. D2 + -21d + 21d = -20 + 21d Combine like terms: -21d + 21d = 0 D2 + 0 = -20 + 21d D2 = -20 + 21d Simplifying D2 = -20 + 21d Reorder the terms: 20 + D2 + -21d = -20 + 21d + 20 + -21d Reorder the terms: 20 + D2 + -21d = -20 + 20 + 21d + -21d Combine like terms: -20 + 20 = 0 20 + D2 + -21d = 0 + 21d + -21d 20 + D2 + -21d = 21d + -21d Combine like terms: 21d + -21d = 0 20 + D2 + -21d = 0 The solution to this equation could not be determined.
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