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Simplifying 45 + 5d = 20d Solving 45 + 5d = 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. 45 + 5d + -20d = 20d + -20d Combine like terms: 5d + -20d = -15d 45 + -15d = 20d + -20d Combine like terms: 20d + -20d = 0 45 + -15d = 0 Add '-45' to each side of the equation. 45 + -45 + -15d = 0 + -45 Combine like terms: 45 + -45 = 0 0 + -15d = 0 + -45 -15d = 0 + -45 Combine like terms: 0 + -45 = -45 -15d = -45 Divide each side by '-15'. d = 3 Simplifying d = 3
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