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