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Simplifying -81 = b + -3(7 + -3b) -81 = b + (7 * -3 + -3b * -3) -81 = b + (-21 + 9b) Reorder the terms: -81 = -21 + b + 9b Combine like terms: b + 9b = 10b -81 = -21 + 10b Solving -81 = -21 + 10b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-10b' to each side of the equation. -81 + -10b = -21 + 10b + -10b Combine like terms: 10b + -10b = 0 -81 + -10b = -21 + 0 -81 + -10b = -21 Add '81' to each side of the equation. -81 + 81 + -10b = -21 + 81 Combine like terms: -81 + 81 = 0 0 + -10b = -21 + 81 -10b = -21 + 81 Combine like terms: -21 + 81 = 60 -10b = 60 Divide each side by '-10'. b = -6 Simplifying b = -6
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