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Simplifying 15[20 + d] = 420 [20 * 15 + d * 15] = 420 [300 + 15d] = 420 Solving 300 + 15d = 420 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-300' to each side of the equation. 300 + -300 + 15d = 420 + -300 Combine like terms: 300 + -300 = 0 0 + 15d = 420 + -300 15d = 420 + -300 Combine like terms: 420 + -300 = 120 15d = 120 Divide each side by '15'. d = 8 Simplifying d = 8
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