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Simplifying 30(20d) = 150 Remove parenthesis around (20d) 30 * 20d = 150 Multiply 30 * 20 600d = 150 Solving 600d = 150 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Divide each side by '600'. d = 0.25 Simplifying d = 0.25
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