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Simplifying 10(d + 9) = 210 Reorder the terms: 10(9 + d) = 210 (9 * 10 + d * 10) = 210 (90 + 10d) = 210 Solving 90 + 10d = 210 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-90' to each side of the equation. 90 + -90 + 10d = 210 + -90 Combine like terms: 90 + -90 = 0 0 + 10d = 210 + -90 10d = 210 + -90 Combine like terms: 210 + -90 = 120 10d = 120 Divide each side by '10'. d = 12 Simplifying d = 12
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