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Simplifying 21 + 6b = 7(3 + -6b) 21 + 6b = (3 * 7 + -6b * 7) 21 + 6b = (21 + -42b) Add '-21' to each side of the equation. 21 + -21 + 6b = 21 + -21 + -42b Combine like terms: 21 + -21 = 0 0 + 6b = 21 + -21 + -42b 6b = 21 + -21 + -42b Combine like terms: 21 + -21 = 0 6b = 0 + -42b 6b = -42b Solving 6b = -42b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '42b' to each side of the equation. 6b + 42b = -42b + 42b Combine like terms: 6b + 42b = 48b 48b = -42b + 42b Combine like terms: -42b + 42b = 0 48b = 0 Divide each side by '48'. b = 0 Simplifying b = 0
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