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Simplifying d + 21 = -7d + -3 Reorder the terms: 21 + d = -7d + -3 Reorder the terms: 21 + d = -3 + -7d Solving 21 + d = -3 + -7d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '7d' to each side of the equation. 21 + d + 7d = -3 + -7d + 7d Combine like terms: d + 7d = 8d 21 + 8d = -3 + -7d + 7d Combine like terms: -7d + 7d = 0 21 + 8d = -3 + 0 21 + 8d = -3 Add '-21' to each side of the equation. 21 + -21 + 8d = -3 + -21 Combine like terms: 21 + -21 = 0 0 + 8d = -3 + -21 8d = -3 + -21 Combine like terms: -3 + -21 = -24 8d = -24 Divide each side by '8'. d = -3 Simplifying d = -3
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