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Simplifying -9(b + -4) = 81 Reorder the terms: -9(-4 + b) = 81 (-4 * -9 + b * -9) = 81 (36 + -9b) = 81 Solving 36 + -9b = 81 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-36' to each side of the equation. 36 + -36 + -9b = 81 + -36 Combine like terms: 36 + -36 = 0 0 + -9b = 81 + -36 -9b = 81 + -36 Combine like terms: 81 + -36 = 45 -9b = 45 Divide each side by '-9'. b = -5 Simplifying b = -5
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