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Simplifying 8d + 3 + -4d = -21 Reorder the terms: 3 + 8d + -4d = -21 Combine like terms: 8d + -4d = 4d 3 + 4d = -21 Solving 3 + 4d = -21 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 4d = -21 + -3 Combine like terms: 3 + -3 = 0 0 + 4d = -21 + -3 4d = -21 + -3 Combine like terms: -21 + -3 = -24 4d = -24 Divide each side by '4'. d = -6 Simplifying d = -6
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