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Simplifying 21 = b + 9 Reorder the terms: 21 = 9 + b Solving 21 = 9 + b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1b' to each side of the equation. 21 + -1b = 9 + b + -1b Combine like terms: b + -1b = 0 21 + -1b = 9 + 0 21 + -1b = 9 Add '-21' to each side of the equation. 21 + -21 + -1b = 9 + -21 Combine like terms: 21 + -21 = 0 0 + -1b = 9 + -21 -1b = 9 + -21 Combine like terms: 9 + -21 = -12 -1b = -12 Divide each side by '-1'. b = 12 Simplifying b = 12
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