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Simplifying 21 + b + 6 = 2b Reorder the terms: 21 + 6 + b = 2b Combine like terms: 21 + 6 = 27 27 + b = 2b Solving 27 + b = 2b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-2b' to each side of the equation. 27 + b + -2b = 2b + -2b Combine like terms: b + -2b = -1b 27 + -1b = 2b + -2b Combine like terms: 2b + -2b = 0 27 + -1b = 0 Add '-27' to each side of the equation. 27 + -27 + -1b = 0 + -27 Combine like terms: 27 + -27 = 0 0 + -1b = 0 + -27 -1b = 0 + -27 Combine like terms: 0 + -27 = -27 -1b = -27 Divide each side by '-1'. b = 27 Simplifying b = 27
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