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Simplifying b + (64 + b) = 90 Remove parenthesis around (64 + b) b + 64 + b = 90 Reorder the terms: 64 + b + b = 90 Combine like terms: b + b = 2b 64 + 2b = 90 Solving 64 + 2b = 90 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-64' to each side of the equation. 64 + -64 + 2b = 90 + -64 Combine like terms: 64 + -64 = 0 0 + 2b = 90 + -64 2b = 90 + -64 Combine like terms: 90 + -64 = 26 2b = 26 Divide each side by '2'. b = 13 Simplifying b = 13
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