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Simplifying -171 = -9(10 + b) -171 = (10 * -9 + b * -9) -171 = (-90 + -9b) Solving -171 = -90 + -9b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '9b' to each side of the equation. -171 + 9b = -90 + -9b + 9b Combine like terms: -9b + 9b = 0 -171 + 9b = -90 + 0 -171 + 9b = -90 Add '171' to each side of the equation. -171 + 171 + 9b = -90 + 171 Combine like terms: -171 + 171 = 0 0 + 9b = -90 + 171 9b = -90 + 171 Combine like terms: -90 + 171 = 81 9b = 81 Divide each side by '9'. b = 9 Simplifying b = 9
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