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Simplifying 20 = 8 + -1(b + 9) Reorder the terms: 20 = 8 + -1(9 + b) 20 = 8 + (9 * -1 + b * -1) 20 = 8 + (-9 + -1b) Combine like terms: 8 + -9 = -1 20 = -1 + -1b Solving 20 = -1 + -1b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add 'b' to each side of the equation. 20 + b = -1 + -1b + b Combine like terms: -1b + b = 0 20 + b = -1 + 0 20 + b = -1 Add '-20' to each side of the equation. 20 + -20 + b = -1 + -20 Combine like terms: 20 + -20 = 0 0 + b = -1 + -20 b = -1 + -20 Combine like terms: -1 + -20 = -21 b = -21 Simplifying b = -21
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