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Simplifying 81 = -7b + 4 Reorder the terms: 81 = 4 + -7b Solving 81 = 4 + -7b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '7b' to each side of the equation. 81 + 7b = 4 + -7b + 7b Combine like terms: -7b + 7b = 0 81 + 7b = 4 + 0 81 + 7b = 4 Add '-81' to each side of the equation. 81 + -81 + 7b = 4 + -81 Combine like terms: 81 + -81 = 0 0 + 7b = 4 + -81 7b = 4 + -81 Combine like terms: 4 + -81 = -77 7b = -77 Divide each side by '7'. b = -11 Simplifying b = -11
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