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Simplifying 21 = (3 + -9d) * 6 Reorder the terms for easier multiplication: 21 = 6(3 + -9d) 21 = (3 * 6 + -9d * 6) 21 = (18 + -54d) Solving 21 = 18 + -54d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '54d' to each side of the equation. 21 + 54d = 18 + -54d + 54d Combine like terms: -54d + 54d = 0 21 + 54d = 18 + 0 21 + 54d = 18 Add '-21' to each side of the equation. 21 + -21 + 54d = 18 + -21 Combine like terms: 21 + -21 = 0 0 + 54d = 18 + -21 54d = 18 + -21 Combine like terms: 18 + -21 = -3 54d = -3 Divide each side by '54'. d = -0.05555555556 Simplifying d = -0.05555555556
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