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Simplifying b + (b + 15) = 21 Reorder the terms: b + (15 + b) = 21 Remove parenthesis around (15 + b) b + 15 + b = 21 Reorder the terms: 15 + b + b = 21 Combine like terms: b + b = 2b 15 + 2b = 21 Solving 15 + 2b = 21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 2b = 21 + -15 Combine like terms: 15 + -15 = 0 0 + 2b = 21 + -15 2b = 21 + -15 Combine like terms: 21 + -15 = 6 2b = 6 Divide each side by '2'. b = 3 Simplifying b = 3
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