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Simplifying 9(b + -90) = 81 Reorder the terms: 9(-90 + b) = 81 (-90 * 9 + b * 9) = 81 (-810 + 9b) = 81 Solving -810 + 9b = 81 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '810' to each side of the equation. -810 + 810 + 9b = 81 + 810 Combine like terms: -810 + 810 = 0 0 + 9b = 81 + 810 9b = 81 + 810 Combine like terms: 81 + 810 = 891 9b = 891 Divide each side by '9'. b = 99 Simplifying b = 99
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