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Simplifying 81 = 10b + -7 + -21b Reorder the terms: 81 = -7 + 10b + -21b Combine like terms: 10b + -21b = -11b 81 = -7 + -11b Solving 81 = -7 + -11b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '11b' to each side of the equation. 81 + 11b = -7 + -11b + 11b Combine like terms: -11b + 11b = 0 81 + 11b = -7 + 0 81 + 11b = -7 Add '-81' to each side of the equation. 81 + -81 + 11b = -7 + -81 Combine like terms: 81 + -81 = 0 0 + 11b = -7 + -81 11b = -7 + -81 Combine like terms: -7 + -81 = -88 11b = -88 Divide each side by '11'. b = -8 Simplifying b = -8
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