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Simplifying b + 2b + (21 + b) = 145 Remove parenthesis around (21 + b) b + 2b + 21 + b = 145 Reorder the terms: 21 + b + 2b + b = 145 Combine like terms: b + 2b = 3b 21 + 3b + b = 145 Combine like terms: 3b + b = 4b 21 + 4b = 145 Solving 21 + 4b = 145 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 4b = 145 + -21 Combine like terms: 21 + -21 = 0 0 + 4b = 145 + -21 4b = 145 + -21 Combine like terms: 145 + -21 = 124 4b = 124 Divide each side by '4'. b = 31 Simplifying b = 31
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