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Simplifying 21 = 9d Solving 21 = 9d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-9d' to each side of the equation. 21 + -9d = 9d + -9d Combine like terms: 9d + -9d = 0 21 + -9d = 0 Add '-21' to each side of the equation. 21 + -21 + -9d = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -9d = 0 + -21 -9d = 0 + -21 Combine like terms: 0 + -21 = -21 -9d = -21 Divide each side by '-9'. d = 2.333333333 Simplifying d = 2.333333333
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