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Simplifying 13b + 42 = 81 Reorder the terms: 42 + 13b = 81 Solving 42 + 13b = 81 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + 13b = 81 + -42 Combine like terms: 42 + -42 = 0 0 + 13b = 81 + -42 13b = 81 + -42 Combine like terms: 81 + -42 = 39 13b = 39 Divide each side by '13'. b = 3 Simplifying b = 3
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