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Simplifying 7b + 21 = b + 21 Reorder the terms: 21 + 7b = b + 21 Reorder the terms: 21 + 7b = 21 + b Add '-21' to each side of the equation. 21 + -21 + 7b = 21 + -21 + b Combine like terms: 21 + -21 = 0 0 + 7b = 21 + -21 + b 7b = 21 + -21 + b Combine like terms: 21 + -21 = 0 7b = 0 + b 7b = b Solving 7b = 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. 7b + -1b = b + -1b Combine like terms: 7b + -1b = 6b 6b = b + -1b Combine like terms: b + -1b = 0 6b = 0 Divide each side by '6'. b = 0 Simplifying b = 0
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