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Simplifying 10(20 + b) = 900 (20 * 10 + b * 10) = 900 (200 + 10b) = 900 Solving 200 + 10b = 900 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-200' to each side of the equation. 200 + -200 + 10b = 900 + -200 Combine like terms: 200 + -200 = 0 0 + 10b = 900 + -200 10b = 900 + -200 Combine like terms: 900 + -200 = 700 10b = 700 Divide each side by '10'. b = 70 Simplifying b = 70
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