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Simplifying -6D + 1 = 4D + 21 Reorder the terms: 1 + -6D = 4D + 21 Reorder the terms: 1 + -6D = 21 + 4D Solving 1 + -6D = 21 + 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. 1 + -6D + -4D = 21 + 4D + -4D Combine like terms: -6D + -4D = -10D 1 + -10D = 21 + 4D + -4D Combine like terms: 4D + -4D = 0 1 + -10D = 21 + 0 1 + -10D = 21 Add '-1' to each side of the equation. 1 + -1 + -10D = 21 + -1 Combine like terms: 1 + -1 = 0 0 + -10D = 21 + -1 -10D = 21 + -1 Combine like terms: 21 + -1 = 20 -10D = 20 Divide each side by '-10'. D = -2 Simplifying D = -2
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