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Simplifying 9 = d * 21 Reorder the terms for easier multiplication: 9 = 21d Solving 9 = 21d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-21d' to each side of the equation. 9 + -21d = 21d + -21d Combine like terms: 21d + -21d = 0 9 + -21d = 0 Add '-9' to each side of the equation. 9 + -9 + -21d = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -21d = 0 + -9 -21d = 0 + -9 Combine like terms: 0 + -9 = -9 -21d = -9 Divide each side by '-21'. d = 0.4285714286 Simplifying d = 0.4285714286
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