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