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Simplifying 2b + 9 = 21 Reorder the terms: 9 + 2b = 21 Solving 9 + 2b = 21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 2b = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 2b = 21 + -9 2b = 21 + -9 Combine like terms: 21 + -9 = 12 2b = 12 Divide each side by '2'. b = 6 Simplifying b = 6
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