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Simplifying 54 = 4 + (21 + -1) * d Combine like terms: 21 + -1 = 20 54 = 4 + (20) * d Solving 54 = 4 + 20d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-20d' to each side of the equation. 54 + -20d = 4 + 20d + -20d Combine like terms: 20d + -20d = 0 54 + -20d = 4 + 0 54 + -20d = 4 Add '-54' to each side of the equation. 54 + -54 + -20d = 4 + -54 Combine like terms: 54 + -54 = 0 0 + -20d = 4 + -54 -20d = 4 + -54 Combine like terms: 4 + -54 = -50 -20d = -50 Divide each side by '-20'. d = 2.5 Simplifying d = 2.5
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