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Simplifying 20 = 100 + -4d Solving 20 = 100 + -4d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '4d' to each side of the equation. 20 + 4d = 100 + -4d + 4d Combine like terms: -4d + 4d = 0 20 + 4d = 100 + 0 20 + 4d = 100 Add '-20' to each side of the equation. 20 + -20 + 4d = 100 + -20 Combine like terms: 20 + -20 = 0 0 + 4d = 100 + -20 4d = 100 + -20 Combine like terms: 100 + -20 = 80 4d = 80 Divide each side by '4'. d = 20 Simplifying d = 20
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