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Simplifying 21 = -1d + 3 + -1d Reorder the terms: 21 = 3 + -1d + -1d Combine like terms: -1d + -1d = -2d 21 = 3 + -2d Solving 21 = 3 + -2d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '2d' to each side of the equation. 21 + 2d = 3 + -2d + 2d Combine like terms: -2d + 2d = 0 21 + 2d = 3 + 0 21 + 2d = 3 Add '-21' to each side of the equation. 21 + -21 + 2d = 3 + -21 Combine like terms: 21 + -21 = 0 0 + 2d = 3 + -21 2d = 3 + -21 Combine like terms: 3 + -21 = -18 2d = -18 Divide each side by '2'. d = -9 Simplifying d = -9
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