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Simplifying 50d + -20d = 650 Combine like terms: 50d + -20d = 30d 30d = 650 Solving 30d = 650 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Divide each side by '30'. d = 21.66666667 Simplifying d = 21.66666667
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